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The Spring-tooth Rake was often objected by farmers because the wire teeth scratched up too much earth getting it on the hay.

Spring-tooth Rake

The Spring-tooth Rake was often objected by farmers because the wire teeth scratched up too much earth…

Many mollusks live upon seaweeds, and the greater number of terrestrial forms are fond of garden vegetables. The food needs to be masticated and the mouth is usually provided with horny jaws, and an additional matricatory apparaus which consists of a kind of tongue with eight to forty thousand minute teeth in our land forms, while in certain marine snails they are beyond computation. With the licking motion of the tongue this rasp tears the food into shreds before it is swallowed. Shown here is a small portion of the radula or tongue-rasp of a snail.

Snail

Many mollusks live upon seaweeds, and the greater number of terrestrial forms are fond of garden vegetables.…

"Hesperornis regalis, (a fossilized restoration) which stood about three feet high, had blunt teeth in the grooves of both maxilla and mandible, the number being thirty or more below, but considerably less above, where they did not reach to the exterior extremity. The bill was long and pointed, the rami of the lower jaw being entirely separate; the head was rather small, the neck long, and the quadrate bone articulated with the skull by one knob only. The sternum was long, broad, and flat, without keel; the furcula was decidedly reduced, the metatarsus, being little more than a humerus; the tail was fairly long and broad, but had no pygostyle." A. H. Evans, 1900

Restoration of Hesperornis regalis

"Hesperornis regalis, (a fossilized restoration) which stood about three feet high, had blunt teeth…

"Under Side of Head of Geomys bursarius, showing entrance of external cheek-pouches and sulcate superior incisors." -Whitney, 1911

Plains Pocket Gopher

"Under Side of Head of Geomys bursarius, showing entrance of external cheek-pouches and sulcate superior…

Wild Oat Grass (Danthonia spicata), also referred to as White Top grass, and Old Fog grass, is common in dry, sunny pastures, with a stem one foot high, slender with short leaves. Narrow sheaths, bearded. The panicle is simple and there are seven flowered spikelets. The lower palea broadly ovate, loosely hairy on the back, longer than its awl-shaped teeth. Perennial and flowers in June. Shown is a seed of this grass.

Wild Oat Grass

Wild Oat Grass (Danthonia spicata), also referred to as White Top grass, and Old Fog grass, is common…

Wild Oat Grass (Danthonia spicata), also referred to as White Top grass, and Old Fog grass, is common in dry, sunny pastures, with a stem one foot high, slender with short leaves. Narrow sheaths, bearded. The panicle is simple and there are seven flowered spikelets. The lower palea broadly ovate, loosely hairy on the back, longer than its awl-shaped teeth. Perennial and flowers in June. Shown is the lower pale.

Wild Oat Grass

Wild Oat Grass (Danthonia spicata), also referred to as White Top grass, and Old Fog grass, is common…

"Bulldog, a variety of the common dog, remarkable for its short, broad muzzle, and the projection of its lower jaw, which causes the lower front teeth to protrude beyond the upper." -Vaughan, 1906

Bulldog

"Bulldog, a variety of the common dog, remarkable for its short, broad muzzle, and the projection of…

"A, symphysis menti; B, angle of jaw; C, body or horizontal ramus; D, coronoid process; E, ascending ramus; F, condyle; the teeth inserted along the alveolar border. The concave line between D and F is the condyloid notch." -Century, 1889

Lower Jawbone of Man

"A, symphysis menti; B, angle of jaw; C, body or horizontal ramus; D, coronoid process; E, ascending…

"Falcons. Bill furnished with a sharp tooth and notch near the end of the cutting edge of the upper mandible (sometimes two such teeth), and the end of under mandible truncated, with notch near the tip. Nostrils circular, high in the cere, with a prominent central tubercle. Inter-nasal septum extensively ossified. Palate with a median keel anteriorly. Superciliary shied prominent, in one large piece. Shoulder-joint strengthened by union of scapular process of the coracoid with the clavicle as in Micrastur, Herpetothers, and the Polyborinae alone of Flaconidae. Wings strong, long, and pointed, with rigid and usually straight and tapering flight-feathers; the tip formed by the 2d and 3d quills, supported nearly to their ends by the 1st and the 4th, both of which are longer then the 5th; only one or two outer primaries emarginate on inner webs near the end. Tail short and stiff, with more or less tapering rectrices. Feet strong, rather short, the tarsus of less length than the tibia, feathered more or less extensively, elsewhere irregularly reculate in small pattern varying with the genera or subgenera; never scutellate in single series before or behind. Middle toe very long; talons very short." Elliot Coues, 1884

Falcons

"Falcons. Bill furnished with a sharp tooth and notch near the end of the cutting edge of the upper…

This gig mill uses a rotating drum head which carries a series of rotating napping roles. This machine is covered with wire teeth that teasel cloth.

Cloth Napping Machine used for Teaseling Woolen Cloth

This gig mill uses a rotating drum head which carries a series of rotating napping roles. This machine…

Dental floss is either a bundle of thin nylon filaments or a plastic ribbon used to remove food and dental plaque from teeth. The floss is gently inserted between the teeth and scraped along the teeth sides, especially close to the gums.

Dental Floss Holder

Dental floss is either a bundle of thin nylon filaments or a plastic ribbon used to remove food and…

A comb is a toothed device used in hair care for straightening and cleaning hair or other fibers. Combs are among the oldest tools found by archaeologists, having been discovered in very refined forms from settlements dating back to 5000 years ago in Persia. Combs can be used for many purposes including: securing long hair in place; decorating the hair; matting sections of hair for dread locking.

Three Teeth Comb

A comb is a toothed device used in hair care for straightening and cleaning hair or other fibers. Combs…

This machine is used to make toothpicks. A toothpick is a small stick of wood, plastic, bamboo, metal or other substance used to remove detritus from the teeth, usually after a meal. Some toothpicks are made from animal bones as opposed to wood. A toothpick usually has one or two sharp ends to insert between teeth. They can also be used for picking up small appetizers or as a cocktail stick.

Toothpick Making Machine

This machine is used to make toothpicks. A toothpick is a small stick of wood, plastic, bamboo, metal…

The driving gear is a machine component consisting of a toothed wheel attached to a rotating shaft. Gears operate in pairs to transmit and modify rotary motion and torque (turning force) without slip, the teeth of one gear engaging the teeth on a mating gear. If the teeth on a pair of mating gears are arranged on circles, i.e., if the gears are toothed wheels, the ratios of the rotary speeds and torques of the shafts are constant.

Driving Gear

The driving gear is a machine component consisting of a toothed wheel attached to a rotating shaft.…

A step block supported by an arm clamp also holds a work piece which has been machined. The step block has a generally right angled triangular configuration and has a saw-teeth portion on the inclined side

Stepping Block

A step block supported by an arm clamp also holds a work piece which has been machined. The step block…

This is a late model toothbrush framing, toothbrushes are instruments which are made using a small brush on a handle. Toothbrushes clean teeth through tooth brushing.

Tooth Brush Framing

This is a late model toothbrush framing, toothbrushes are instruments which are made using a small brush…

A cast iron hub with teeth inserted spirally attached to a mandrel to create a gear.

Sectional Milling Cutters with Inserted Teeth Tool

A cast iron hub with teeth inserted spirally attached to a mandrel to create a gear.

"The workpiece is fastened on a round platen, which in turn is attached to the table of a large and heavy vertical boring machine. The mill arbor bears a profile mill with inserted teeth, and the table has power feed. The operation is cheaper than turning in the lathe." —Grimshaw, 1902

Ring Milling

"The workpiece is fastened on a round platen, which in turn is attached to the table of a large and…

A saw set is a device used in the sharpening of hand saws. Once the teeth have been jointed and filed, the saw set is used to adjust the set of each tooth.

Saw Set

A saw set is a device used in the sharpening of hand saws. Once the teeth have been jointed and filed,…

The lower jaw and teeth of the Megatherium, elephant sized sloth. The teeth are quandrangular, or triangular cylinder, shaped and grew during their life time.

Lower Jaw of Megatherium Fossil Skeleton

The lower jaw and teeth of the Megatherium, elephant sized sloth. The teeth are quandrangular, or triangular…

Illustration showing the upper molar teeth of the megatherium, a giant sloth. The teeth were 7 to 8 inches inside the gums.

Upper Molar Teeth of Megatherium Fossil Skeleton

Illustration showing the upper molar teeth of the megatherium, a giant sloth. The teeth were 7 to 8…

A partial or complete set of artificial teeth for either the upper or lower jaw. Also called dental plate.

Dental Anchorage Denture

A partial or complete set of artificial teeth for either the upper or lower jaw. Also called dental…

A side view of the howler monkey skull. The monkey have four sharp canines, long teeth on skull, on top and bottom of the jaw.

Side View of Howler Monkey

A side view of the howler monkey skull. The monkey have four sharp canines, long teeth on skull, on…

A brush used for cleaning teeth.

Tooth Brush

A brush used for cleaning teeth.

A long-handled implement with a row of projecting teeth at its head, used especially to gather leaves or to loosen or smooth earth.

Tool Combination Rake

A long-handled implement with a row of projecting teeth at its head, used especially to gather leaves…

Any similar tool or device, as a rotating disk, in which a sharp continuous edge replaces the teeth.

Hack Saw

Any similar tool or device, as a rotating disk, in which a sharp continuous edge replaces the teeth.

An artificial replacement of one or several of the teeth (partial denture), or all of the teeth (full denture) of either or both jaws; dental prosthesis.

Replacement Denture

An artificial replacement of one or several of the teeth (partial denture), or all of the teeth (full…

A long-handled tool with a row of teeth at its head; used to move leaves or loosen soil

Multipurpose Rake

A long-handled tool with a row of teeth at its head; used to move leaves or loosen soil

A flower in the buckwheat family. A drooping flower with a white tube and green deltoid teeth.

Polygonum Japonicum

A flower in the buckwheat family. A drooping flower with a white tube and green deltoid teeth.

The flower heads of gundelia tourneforth are purple and large. The flowers grow in clusters at the end of the stems. The lobes and teeth of the leaves are very spiny.

Gundelia Tourneforth

The flower heads of gundelia tourneforth are purple and large. The flowers grow in clusters at the end…

Hibbertia perfoliata flowers are pale yellow. The flowers bloom in summer. The leaves are edged with minute, distant teeth.

Flowering Branch of Hibbertia Perfoliata

Hibbertia perfoliata flowers are pale yellow. The flowers bloom in summer. The leaves are edged with…

Ilex aquifolium crassifolia is a green leaved variety of holly. The leaves are dull green. The leaves are very thick with recurved tips and margins. The leaves have prominent, saw like teeth.

Leaf of Ilex Aquifolium Crassifolia

Ilex aquifolium crassifolia is a green leaved variety of holly. The leaves are dull green. The leaves…

Ilex aquifolium ovata is a green leaved variety of holly. The leaves are about two and a half inches long. The leaves have scarce, spiny teeth.

Leaf of Ilex Aquifolium Ovata

Ilex aquifolium ovata is a green leaved variety of holly. The leaves are about two and a half inches…

The seed vessel of lychnis burst open lengthwise. The capsule opens by as many teeth as there are styles.

Seed Vessel of Lychnis

The seed vessel of lychnis burst open lengthwise. The capsule opens by as many teeth as there are styles.

This illustration shows a fret saw in use. The blade is a thread of metal with teeth, set in a 'U'-shaped frame called a 'ben'.

Fret Saw, in use

This illustration shows a fret saw in use. The blade is a thread of metal with teeth, set in a 'U'-shaped…

Found in Oueensland and other parts of Australia, this lizard belongs to the family Agamidae. It reaches a length of about thirty-two inches, and receives its name from the presence of a large expansion of skin at either side of the neck. This frill is notched at the edge, has special supporting cartilages, and by means of muscles can be folded or expanded at will. The lizard walks upon its hind limbs, like the extinct Iguanodon, having the fore limbs hanging down. When at bay, it expands the frill to its fullest extent and opens the mouth wide, exposing its teeth. It inhabits sandy districts.

Frilled Lizard

Found in Oueensland and other parts of Australia, this lizard belongs to the family Agamidae. It reaches…

The Gadwall (Chaulelasmus streperus) is a widely distributed duck, appearing throughout Europe and N. America, as well as in Asia and the north of Africa. It is a freshwater species, remarkable for the great development of the comb-like 'teeth' at the margin of the bill. It is 19-20 inches long, generally grayish, finely mottled, with chestnut wing coverts. The underside of the wing pure white, while the speculum of the drake is blue.

Gadwall Duck

The Gadwall (Chaulelasmus streperus) is a widely distributed duck, appearing throughout Europe and N.…

The bill of the Gadwall Duck, showing the comb-like 'teeth' that they are known for.

Bill of Gadwall

The bill of the Gadwall Duck, showing the comb-like 'teeth' that they are known for.

Galeopithecus is the generic name of certain mammals from the Malayan region, commonly (incorrectly) referred to as flying lemurs. The two species of Galeopithecus are now placed in a sub-order of Insectivora, and regarded as the vegetarian analogues of the insect-eating bats. The common species, G. volans, is about the size of a cat and has a flying-membrane. The teeth are remarkable, the lower incisors being comb-like, while the upper outer incisor at each side has two roots. Galeopithecus primarily inhabit forests. They feed upon leaves, fruit, eggs, insects, and even small birds. They are nocturnal. Though incapable of true flight, they can take long, flying leaps.

Galeopithecus

Galeopithecus is the generic name of certain mammals from the Malayan region, commonly (incorrectly)…

This illustration shows an example of a bevel gear.

Bevel (gear)

This illustration shows an example of a bevel gear.

Helical gearing is a modification of ordinary toothed gearing in which the pitch surfaces may be cylinders or cones (as in spur or bevel gearing); but the teeth intersect the pitch surfaces in helical lines. These wheels work much more smoothly and provide more resilience than ordinary gearing.

Helical Gearing

Helical gearing is a modification of ordinary toothed gearing in which the pitch surfaces may be cylinders…

Screw-and-Worm gearing is a type of gearing in which the velocity ratio is independent of the radii of the pitch surfaces, the teeth of the wheels essentially being portions of screw surfaces. This kind of gearing is used in speed-reducing arrangements.

Screw-and-Worm Gearing

Screw-and-Worm gearing is a type of gearing in which the velocity ratio is independent of the radii…

The Greyhound as a show dog is judged as follows: height and weight, ranging from 23 to 27 in. and from 40 to 70 lbs.; skull rather wide between the ears and flat on the top, with powerful, though not clumsy, jaws, and very strong teeth; eyes dark in color, and full of fire; ears rather small, and fine in texture; neck long and powerful (to enable it to reach the hare) yet graceful looking; chest of fair width, and very deep; body rather long, extremely powerful, especially at the loins, and slightly arched -- the back ribs being short, make the body appear tucked up; shoulders sloping; fore legs set in well under the dog, straight and powerful, with round, compact feet, the knuckles of the toes being well developed; hind quarters very powerful, with muscular thighs and well-bent stifles; tail long, and carried low; colors black, red, fawn, brindled, blue, white, either whole-colored or marked.

Greyhound

The Greyhound as a show dog is judged as follows: height and weight, ranging from 23 to 27 in. and from…

After the softening process in the manufacturing of jute, the fibers are about six feet long, and are passed onto the breaker card, where they are reduced in length, finely divided, thoroughly mixed, cleared of impurities, and laid in parallel order. The chief features of the card are a cylinder about four feet in diameter covered with wooden staves filled with steel teeth, and around this cylinder a number of smaller cylinders, known as strippers and workers, also covered with steel teeth. The jute fibers are carried around the large cylinder, being finely divided by the workers and strippers in their course. A doffer roller then strips the elongated lap from the main cylinder and sends it down a broad channel, which compresses it to a strand or sliver about four inches wide. Twelve of these slivers are then fed into the finisher card, which is similar to the breaker, but has finer teeth, and are drawn out into a finer, smoother strand.

Carding Process in the Manufacuring of Jute

After the softening process in the manufacturing of jute, the fibers are about six feet long, and are…

The Great Kangaroo, or 'boomer', or 'old man' (Macropus giganteus), attains a height of about five feet when standing upright. The fore limbs are very short, the hind long, with powerful, elongated feet. The fore limbs bear five digits armed with strong claws; the hind have only four. The head is small, with pointed muzzle and large ears. In accordance with its purely vegetarian habits, canine teeth are absent in the adult. The incisors are powerful, with a cutting edge. The fur is soft and woolly, and lighter in tint below than above. In the female there is a large pouch, in which the young are placed at birth, and become attached by their immature months to the nipples. At this time they are minute -- not more than an inch in length -- and, being to immature to suck, have milk pumped into them by their mother. They remain withing the pouch until able to run by the side of the parent. Not until some eight or nine months after birth are they left to shift entirely for themselves. Only one young one is produced at a birth. As regards internal organs, the stomach is large and complex, and the characteristic marsupial or epipubic bones are present.

Great Kangaroo

The Great Kangaroo, or 'boomer', or 'old man' (Macropus giganteus), attains a height of about five feet…

This illustration shows a section of a tooth of a typical Labyrinthodont. Labyrinthodont, or Stegocephali is a race of extinct amphibians, the remains of which are found in the Permian, Carboniferous, and Triassic strata. Many of them were giants compared with our modern amphibians, from which they differed markedly in possessing an armature of bony plates in various degrees of completeness. In general habit, they resembled the newt or salamander. The name Labyrinthodont refers to the mazy pattern exhibited on a transverse section of the teeth of some genera. Among the best known genera are Archegosaurus, Loxomma, and Mastodonsaurus.

Section of Tooth of Typical Labyrinthodont

This illustration shows a section of a tooth of a typical Labyrinthodont. Labyrinthodont, or Stegocephali…

Lamium album (also known as the white dead-nettle, or archangel) is a member of the Lamium, a genus of Labiatæ, whose flowers are marked by possessing four stamens longer than the corolla tube, a bell-shaped calyx with five teeth, and a two-lipped corolla, the upper lip being arched, the lower trifid and spreading. It has been naturalized in America and has a square stem and white flowers with black stamens.

Lamium Album

Lamium album (also known as the white dead-nettle, or archangel) is a member of the Lamium, a genus…

This illustration shows an enlarged view of the mouth of a lamprey.

Mouth of Lamprey

This illustration shows an enlarged view of the mouth of a lamprey.

Inserted (nicked) teeth.

Inserted Teeth

Inserted (nicked) teeth.

"But when the king came in to behold the guests, he saw there a man who had not on a wedding-garment: and he saith unto him, Friend, how camest thou in hither not having a wedding-garment? And he was speechless. Then the king said to the servants, Bind him hand and foot, and cast him out into the outer darkness; there shall be the weeping and the gnashing of teeth. For many are called, but few chosen." Matthew 22:11-14 ASV <p>Illustration of a king casting out improperly-dressed guest from the wedding feast for his son. Other guests sit in the background. The king holds a scepter.

Parable of the Marriage Feast

"But when the king came in to behold the guests, he saw there a man who had not on a wedding-garment:…

This illustration includes numerous types of saws: a. Circular saw (right-hand and left-hand saws have the teeth running opposite directions); b. section of circular saw showing flange at c; d. concave saw; e. circular saw with inserted teeth; f. mill-saw; g. ice-saw; h. cross-cut saw; i. band-saw; j. rip-saw; k. hand-saw; l. panel-saw; m. pruning-saw; n. whip-saw; o. wood-saw; p. keyhole or compass-saw; q. back-saw; r. bow-back butchers' saw.

Collection of Saws

This illustration includes numerous types of saws: a. Circular saw (right-hand and left-hand saws have…

<i>Pristis pectinatus</i>. "1. An elasmobranchiate or selachian fish of the family <i>Pristidae</i>, having the snout prolonged into a flat saw or serra beset on each side with horizontal teeth pointing sidewise." &mdash;Whitney, 1889

Sawfish, Side View

Pristis pectinatus. "1. An elasmobranchiate or selachian fish of the family Pristidae, having the snout…

A saw-set is an "instrument used to wrest or turn the teeth of saws alternately to the right left so that they may make a kerf somewhat wider than the thickness of the blade. Also called saw-wrest. b. anvil used for setting saws in saw-factories, the setting being performed by blows of the peculiarly shaped hammer; a. Every second tooth is set in one direction, and, the saw-blade being turned over, the intervening teeth are set in the reverse direction; c and d are notched levers by which in ordinary setting the alternate teeth are set in opposite directions." —Whitney, 1889

Collection of Saw-Sets

A saw-set is an "instrument used to wrest or turn the teeth of saws alternately to the right left so…

"a. shank for fixing the implement to a bench; c. punch, hinged to a base b and e; and pressed upward by springs; h. screw-support for the back of the blade; d. gauge which may be adjusted for different-sized teeth. The blade is moved along to bring alternate teeth under the punch, which his struck with a hammer." &mdash;Whitney, 1889

Saw Set for a Work Bench

"a. shank for fixing the implement to a bench; c. punch, hinged to a base b and e; and pressed upward…

Close-up illustration of scalpriform incisor of a beaver. It is "chisel-shaped; having the character of a chisel-tooth; truncate at the end and beveled there to a sharp edge; specifically said of the incisor teeth of rodents, and the similar teeth of a few other mammals." &mdash;Whitney, 1889

Scalpriform, Left Lower Incisor of a Beaver

Close-up illustration of scalpriform incisor of a beaver. It is "chisel-shaped; having the character…

<i>Pristis pectinatus</i>. "1. An elasmobranchiate or selachian fish of the family <i>Pristidae</i>, having the snout prolonged into a flat saw or serra beset on each side with horizontal teeth pointing sidewise." &mdash;Whitney, 1889

Sawfish, View from Underneath

Pristis pectinatus. "1. An elasmobranchiate or selachian fish of the family Pristidae, having the snout…

"...a variety of calcite, crystallizing in scalenohedral forms; so named from a fancied resemblance of its crystals to canine teeth." —Whitney, 1889

Dogtooth Spar

"...a variety of calcite, crystallizing in scalenohedral forms; so named from a fancied resemblance…