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Development and top completion exercise problem of the cone by dividing the base into equal parts and creating an arc to revolve the sides of the plane.

Development Exercise of Cone

Development and top completion exercise problem of the cone by dividing the base into equal parts and…

An exercise problem to complete the top and develop, stretched out, image of the flange and hood cones by using series of cone development.

Development Exercise of Flange and Hood Cones

An exercise problem to complete the top and develop, stretched out, image of the flange and hood cones…

The problem exercise in completing the top view and creating the development, or rolled out, image of the pentagonal pyramid.

Development Exercise of Pentagonal Pyramid

The problem exercise in completing the top view and creating the development, or rolled out, image of…

A sample exercise problem to complete the top part and create a stretched out image of the oblique hexagonal pyramid. The stretched out image is created by drawing an arc with the perimeter of the base stepped off to create an intersection point.

Development Exercise of Oblique Hexagonal Pyramid

A sample exercise problem to complete the top part and create a stretched out image of the oblique hexagonal…

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…

"To enable the drawing of long parallel, the head must have been a long contact surface with the edge of the board. It must also be wide enough to hold the blade stiffly." —Grimshaw, 1902

Fixed Triangular Head T Square

"To enable the drawing of long parallel, the head must have been a long contact surface with the edge…

The development, or unfolded prism, of the rectangular pyramid. The sides of the prism is joined at point E for reference, and the shape of the sides are by using the reference point.

Development of Rectangle Pyramid

The development, or unfolded prism, of the rectangular pyramid. The sides of the prism is joined at…

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…

A triangular nanogram star with 9 points. This nine point star is created by drawing nine diagonal lines at an acute angles, creating a triangular look.

Triangular Nine Point Nanogram Star

A triangular nanogram star with 9 points. This nine point star is created by drawing nine diagonal lines…

"Ruccinate, when the divisions of a pinnatifid leaf are more or less triangular, and pointing downwards."—Darby, 1855

Ruccinate Leaf

"Ruccinate, when the divisions of a pinnatifid leaf are more or less triangular, and pointing downwards."—Darby,…

"The Hesperidium is a fleshy fruit, in which the epicarp and mesocarp form a thick rind, and the endocarp projects inward, forming triangular divisions, in which pulpy cells are developed, which surround the seeds."—Darby, 1855

Hesperidium

"The Hesperidium is a fleshy fruit, in which the epicarp and mesocarp form a thick rind, and the endocarp…

The flowers of aster turbinellus are a delicate mauve color. The leaves are narrow, triangular, and pointy.

Aster Turbinellus

The flowers of aster turbinellus are a delicate mauve color. The leaves are narrow, triangular, and…

The common name of briza minor is Little Quaking Grass. The spikelets are triangular and seven flowered. The leaves are short, narrow, and pale green.

Habit and Small Panicle of Flowers of Briza Minor

The common name of briza minor is Little Quaking Grass. The spikelets are triangular and seven flowered.…

Gymnogramme calomelanos peruviana ferns have smaller fronds than other gymnogramme ferns. The leaves and fronds have a triangular shape.

Gymnogramme Calomelanos Peruviana

Gymnogramme calomelanos peruviana ferns have smaller fronds than other gymnogramme ferns. The leaves…

Gymnogramme decomposita ferns have lance and triangular shaped fronds. This fern is covered in yellow powder.

Gymnogramme Decomposita

Gymnogramme decomposita ferns have lance and triangular shaped fronds. This fern is covered in yellow…

Hedera helix lucida is an ivy with triangular, glossy leaves. This ivy is a fast grower.

Hedera Helix Lucida

Hedera helix lucida is an ivy with triangular, glossy leaves. This ivy is a fast grower.

Triangular hoes are sometimes used for making drills.

Triangular Hoe

Triangular hoes are sometimes used for making drills.

Hyophorbe verschaffeltii an ornamental stove palm. The leaves are four to six feet long. The sheath of the leaves form a triangular, column shaped stem.

Hyophorbe Vershaffeltii

Hyophorbe verschaffeltii an ornamental stove palm. The leaves are four to six feet long. The sheath…

The flowers of philodendron speciosum are purplish green on the outside and purplish red on the inside. The leaves are green and have a triangular shape.

Philodendron Speciosum

The flowers of philodendron speciosum are purplish green on the outside and purplish red on the inside.…

<I>Apicra pentagona</I> has an erect stem that is six to twelve inches tall. The flowers are a greenish color. The leaves are somewhat triangular and are white dotted.

Apicra Pentagona

Apicra pentagona has an erect stem that is six to twelve inches tall. The flowers are a greenish color.…

The common names of <I>Arum maculatum</I> are lords-and-ladies, cuckoo-pint, and wake robin. The plant usually grows about one foot tall. The leaves are black spotted and triangular.

Arum Maculatum

The common names of Arum maculatum are lords-and-ladies, cuckoo-pint, and wake robin. The plant usually…

<I>Arum italicum</I> is larger than the maculatum variety. The leaves are triangular and light veined. The flower is yellowish or white.

Arum Italicum

Arum italicum is larger than the maculatum variety. The leaves are triangular and light veined. The…

Illustrated is a triangular leaf cutting of begonia.

Leaf Cutting

Illustrated is a triangular leaf cutting of begonia.

Pictured is a plant arising from the base, or tip, of a triangular leaf cutting of begonia.

Plant Arising from Begonia

Pictured is a plant arising from the base, or tip, of a triangular leaf cutting of begonia.

Illustrated is carex lurida with the stamen terminal spikes and triangular seeds.

Carex Lurida

Illustrated is carex lurida with the stamen terminal spikes and triangular seeds.

Calabazilla is the common name of curcurbita foetidissima. The leaves are large, heart shaped, and triangular. The fruit is not edible.

Curcurbita Foetidissima

Calabazilla is the common name of curcurbita foetidissima. The leaves are large, heart shaped, and triangular.…

European larch is the common name of larix decidua. The branchlets are slender and yellowish. The leaves are soft and triangular.

European Larch

European larch is the common name of larix decidua. The branchlets are slender and yellowish. The leaves…

Merope angulata is a small spiny tree native to Indonesia. The fruits are triangular and one to two inches long.

Merope Angulata

Merope angulata is a small spiny tree native to Indonesia. The fruits are triangular and one to two…

Monkey pot nut, sapucaia or sapucaya nut, and paradise nut is the common name of the fruit of lecythis. The nut is oblong and irregularly shaped, though somewhat triangular. The nut resembles a Brazil nut.

Monkey Pot Nut

Monkey pot nut, sapucaia or sapucaya nut, and paradise nut is the common name of the fruit of lecythis.…

The general rule of downward pressure is "the pressure upon the bottom of a vessel containing a fluid is independent of the shape of the vessel, and is equal to the weight of a prism of the fluid whose base has the same area as the bottom of the vessel, and whose altitude is the distance between the bottom and the upper surface of the fluid, plus the pressure per unit of area upon the upper surface of the fluid multiplied by the area of the bottom of the vessel."

General Law

The general rule of downward pressure is "the pressure upon the bottom of a vessel containing a fluid…

This illustration shows the union of a pyramid and a prism of the same order.

Union of a Pyramid and a Prism of the Same Order

This illustration shows the union of a pyramid and a prism of the same order.

This illustration shows the union of a pyramid and a prism of different orders.

Union of a Pyramid and a Prism of Different Orders

This illustration shows the union of a pyramid and a prism of different orders.

This form shows the planes given on a crystal of hydrous nickel sulphate: the basal pinacoid, (c); three pyramids of the second order, (m), (o), and (q); two pyramids of the first order, (n) and (p); and the prisms of the first and second orders, (r) and (s).

Hydrous Nickel Sulphate

This form shows the planes given on a crystal of hydrous nickel sulphate: the basal pinacoid, (c); three…

This form shows a very complex combination of thirteen tetragonal forms occuring on the mineral Vesuvianite: the prism of the first order, (d); prism of the second order, (M); basal pinacoid, (s); three pyramids of the first order, (c), (b), and (u); the ditetragonal prism (f); and the four ditetragonal pyramids (z), (x), (e), and (a).

Vesuvianite

This form shows a very complex combination of thirteen tetragonal forms occuring on the mineral Vesuvianite:…

Also known as Stolzite, this crystal is bounded by the unit pyramid of the first order, P, {111} (o), and by the prism of the third order, (p).

Lead Tungstate

Also known as Stolzite, this crystal is bounded by the unit pyramid of the first order, P, {111} (o),…

Also known as Fergusonite, this crystal shows the basal pinacoid, (c); the unit pyramid, (s); and the pyramid and prism of the third order, (z) and (r) respectively.

Yttrium Niobate

Also known as Fergusonite, this crystal shows the basal pinacoid, (c); the unit pyramid, (s); and the…

This figure shows a combination of forms sometimes observed on the silicate Scapolite, with the unit pyramid, (o); the prisms of the first and second orders, (M) and (b) respectively; and the pyramid of the third order, (s).

Scapolite

This figure shows a combination of forms sometimes observed on the silicate Scapolite, with the unit…

This crystal of Calcium Phosphate, Apatite, represents a complex combination of hexagonal hemihedral forms produced by the pyramidal selection. The nine forms comprise the basal pinacoid ,(P); the prism of the first order, (M); second order, (u); and third order, (h); three pyramids of the first order, (r), (x), and (y); one pyramid of the second order, (s); and one of the third order, (m).

Calcium Phosphate, Apatite

This crystal of Calcium Phosphate, Apatite, represents a complex combination of hexagonal hemihedral…

This is a crystal of Copper Silicate (Dioptase) with a rhombohedron of the third order, (s), in combination with the prism of the second order, (m), and the negative rhombohedron, (r). This crystal is an example of rhombohedral tetartohedrism in the hexagonal system.

Copper Silicate Showing Rhombohedral Tetartohedrism In the Hexagonal System

This is a crystal of Copper Silicate (Dioptase) with a rhombohedron of the third order, (s), in combination…

This crystal is mainly terminated by a rhombohedron of the third order, (x). With this form are associated the prisms of the first and the second order, (m) and (a); another rhombohedron of the third order, (s), and the two rhombohedrons of the first order, (r).

Phenacite

This crystal is mainly terminated by a rhombohedron of the third order, (x). With this form are associated…

This crystal of Tourmaline exhibits hemimorphism in the direction of the vertical axis. Its forms are the prisms, (g), which as a result of hemimorphism, appear as a trigonal prism, and (a); the scalenohedron, (s), and the two rhombohedrons, (R) and (r), at the antilogue pole, while only (R) occurs at the analogue pole.

Tourmaline

This crystal of Tourmaline exhibits hemimorphism in the direction of the vertical axis. Its forms are…

This is an orthorhombic crystal of olivine. It is formed by the orthorhombic prism in combination with two pinacoids.

Orthorhombic Crystal of Olivine

This is an orthorhombic crystal of olivine. It is formed by the orthorhombic prism in combination with…

This form shows the fundamental prism (p) on a crystal of topaz, in combination with another prism, (p'); the basal pinacoid, (c); the brachydome, (g); and the four pyramids, (o), (o'), (o''), and (x).

Orthorhombic Crystal of Topaz

This form shows the fundamental prism (p) on a crystal of topaz, in combination with another prism,…

This figure shows two twin rhombohedrons, symmetrical with reference to a prism of the first order, but without any composition face. There is a complete interpenetration of their substance, and the space common to both is very irregularly distributed between them, as may be shown by an examination in polarized light.

Twin Rhombohedrons

This figure shows two twin rhombohedrons, symmetrical with reference to a prism of the first order,…

This crystal of Aragonite shows a method of twinning where the twinning plane may change its direction, as when the two symmetrical faces of a prism successively serve as twinning planes.

Cyclic Twinning

This crystal of Aragonite shows a method of twinning where the twinning plane may change its direction,…

The tetragonal rutile grows upon the rhombohedral titanic iron, so that its prism of the second order, ∞ P ∞ (100), coincides with the basal pinacoid of the latter mineral, while its vertical axis has the direction of one of the intermediate lateral axes of the iron ore.

Rutile Growing Upon Titanic Iron

The tetragonal rutile grows upon the rhombohedral titanic iron, so that its prism of the second order,…

A rose cut is a cut of gemstone. In this cut, the upper surface is shaped into triangular facets of nearly equal size throughout.

Rose Cut

A rose cut is a cut of gemstone. In this cut, the upper surface is shaped into triangular facets of…

This image shows one of Friedrich Froebel's divided cube (this one divided into many smaller cubes and prisms). Froebel's cubes were used to encourage creativity in kindergarten-age children. The children could rearrange the smaller shapes into combinations that showed life, knowledge, and beauty.

Froebel's Divided Cube (Complex)

This image shows one of Friedrich Froebel's divided cube (this one divided into many smaller cubes and…

A lateen-sail is a triangular sail extended on a yard which is slung one quarter from the lower end to a mast, and rigged in such a way that the upper end is raised in the air, and the lower end is brought down to form the tack. The word is merely a corruption of "latin," and the rig is mainly used in the Mediterranean and on sailing canoes and small boats.

Boat with Lateen-sail

A lateen-sail is a triangular sail extended on a yard which is slung one quarter from the lower end…

The medicinal leech is a leech used in bloodletting. It lives in fresh water, and is common in Germany, Bohemia, and Russia. Its diet consists of the blood of vertebrates, to which the leech attaches itself by its suckers. Of these, one is posterior and imperforate, the other anterior, with the mouth in the center. Within the mouth lie three triangular tooth-plates, by means of which a small triradiate incision is made in the skin of the animal attacked. This done, the leech proceeds to fill its crop, which extends almost from end to end of the body, and has eleven lateral pockets. When these have become distended with blood, the leech drops from its temporary host, and the slow process of digestion begins. Leeches usually move by attaching alternately the anterior and posterior suckers, somewhat after the fashion of a 'looping caterpillar', but they can also swim by movements of the whole body. The eggs are laid in cocoons in damp earth.

Medicinal Leech

The medicinal leech is a leech used in bloodletting. It lives in fresh water, and is common in Germany,…

A gable is the triangular part of an exterior wall between the side walls and the slopes of the roof.

Gable

A gable is the triangular part of an exterior wall between the side walls and the slopes of the roof.

"In the beginning God created the heavens and the earth." Genesis 1:1 ASV <p>Illustration of God sitting on a cloud with his arms outstretched as he creates the earth. He has a triangular halo behind his head. Adam and Eve (left) stand partially hidden by plants and Adam reaches out to the animals, including an elephant, turtle, snake, rooster, lion, rabbit, horse, peacock, tropical bird, sheep, duck, elk, and goat.

The Creation of the World - Adam and Eve, Animals, Plants,

"In the beginning God created the heavens and the earth." Genesis 1:1 ASV Illustration of God sitting…

"An instrument having two or three sides or edges for cleaning the decks, masts, or planking of ships, etc." &mdash;Whitney, 1889 <p>Illustration of a tool with a triangular head and a handle.

Ship Scraper

"An instrument having two or three sides or edges for cleaning the decks, masts, or planking of ships,…

"...the triangular space comprehended between the outer curve or extrados of an arch, a horizontal line drawn through its apex, and a vertical line through its springing; also, the wall-space between the outer moldings of two arches and a horizontal line or string-course above them, or between these outer moldings and the intrados of another arch rising above and inclosing the two. In medieval architecture the spandrels are often ornamented with tracery, sculptured foliage, and the like." —Whitney, 1889 <p>Illustration of a spandrel from the cloisters at Mont Saint-Michel in France.

Sculptured Spandrel from Mont Saint-Michel

"...the triangular space comprehended between the outer curve or extrados of an arch, a horizontal line…

"An instrument used chiefly to measure the angular deviation of light rays in passing through a prism, and hence to determine the refractive indices of the substance of which the prism is formed." &mdashWhitney;, 1889

Spectrometer

"An instrument used chiefly to measure the angular deviation of light rays in passing through a prism,…

"...a tube with a slit at the further end through which the light enters, and at the other end a collimating lens which brings the rays into a parallel beam (the slit is formed between two parallel edges the distance between which can be varied at will)..." —Whitney, 1889

Prism Spectroscope from the Late 19th Century

"...a tube with a slit at the further end through which the light enters, and at the other end a collimating…

"...an instrument which gives a spectrum when the source of the light is in a straight line with the eye&mdash;that is, which gives dispersion without deviation&mdash;is called a direct vision spectroscope..." —Whitney, 1889

Direct Vision Spectroscope

"...an instrument which gives a spectrum when the source of the light is in a straight line with the…

<i>Inachus dorsettensis</i>. "A spider-like crab, or sea-spider, with long slender legs and comparatively small triangular body. The name is given to many such crabs, of different families, but especially to the maioids, or crabs of the family <i>Maiidae</i>..." &mdash;Whitney, 1889 <p>Illustration of a male Scorpion Spider Crab.

Scorpion Spider Crab

Inachus dorsettensis. "A spider-like crab, or sea-spider, with long slender legs and comparatively small…