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Round clock with Roman numerals showing time 12:24

Clock 12:24

Round clock with Roman numerals showing time 12:24

Round clock with Roman numerals showing time 12:25

Clock 12:25

Round clock with Roman numerals showing time 12:25

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Round clock with Roman numerals showing time 12:26

Round clock with Roman numerals showing time 12:27

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Round clock with Roman numerals showing time 12:27

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Round clock with Roman numerals showing time 12:28

Round clock with Roman numerals showing time 12:29

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Round clock with Roman numerals showing time 12:29

Round clock with Roman numerals showing time 12:30

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Round clock with Roman numerals showing time 12:30

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Round clock with Roman numerals showing time 12:31

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Round clock with Roman numerals showing time 12:32

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Round clock with Roman numerals showing time 12:33

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Round clock with Roman numerals showing time 12:34

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Round clock with Roman numerals showing time 12:35

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Round clock with Roman numerals showing time 12:36

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Round clock with Roman numerals showing time 12:37

Round clock with Roman numerals showing time 12:38

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Round clock with Roman numerals showing time 12:38

Round clock with Roman numerals showing time 12:39

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Round clock with Roman numerals showing time 12:39

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Round clock with Roman numerals showing time 12:40

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Round clock with Roman numerals showing time 12:41

Round clock with Roman numerals showing time 12:42

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Round clock with Roman numerals showing time 12:42

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Round clock with Roman numerals showing time 12:43

Round clock with Roman numerals showing time 12:44

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Round clock with Roman numerals showing time 12:44

Round clock with Roman numerals showing time 12:45

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Round clock with Roman numerals showing time 12:45

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Round clock with Roman numerals showing time 12:46

Round clock with Roman numerals showing time 12:47

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Round clock with Roman numerals showing time 12:47

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Round clock with Roman numerals showing time 12:48

Round clock with Roman numerals showing time 12:49

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Round clock with Roman numerals showing time 12:49

Round clock with Roman numerals showing time 12:50

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Round clock with Roman numerals showing time 12:50

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Round clock with Roman numerals showing time 12:51

Round clock with Roman numerals showing time 12:52

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Round clock with Roman numerals showing time 12:52

Round clock with Roman numerals showing time 12:53

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Round clock with Roman numerals showing time 12:53

Round clock with Roman numerals showing time 12:54

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Round clock with Roman numerals showing time 12:54

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Round clock with Roman numerals showing time 12:55

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Round clock with Roman numerals showing time 12:56

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Round clock with Roman numerals showing time 12:57

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Round clock with Roman numerals showing time 12:58

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Round clock with Roman numerals showing time 12:59

"The saxophone, a brass musical instrument invented by Adolphe Sax. It consists of a conical brass tube, curved forward and upwards at the bottom, and having a short section bent backwards at the top, upon which a mouthpiece and a reed resembling those of the clarinet are fitted." —Finley, 1917

Saxophone

"The saxophone, a brass musical instrument invented by Adolphe Sax. It consists of a conical brass tube,…

"A shekel from the time of Judas Maccabaeus."—Finley, 1917

Shekel

"A shekel from the time of Judas Maccabaeus."—Finley, 1917

"A shilling from the time of Henry VII."—Finley, 1917

Shilling

"A shilling from the time of Henry VII."—Finley, 1917

"In making a short splice the ends of the ropes are unlaid for a short distance and brought together, the strands interlacing (A). Taking any one strand, this is woven into the laid strands of the other rope, working from left to right; the other two stands are similarly woven, but from right to left."—Finley, 1917

Short splice

"In making a short splice the ends of the ropes are unlaid for a short distance and brought together,…

Diagram of nervous system. Labels: a, a, cortex of cerebral hemispheres; b, b, cell body and dendrites of upper motor neuron, situated in cerebral cortex; b', axon of upper motor neuron, branching at its termination near the dendrites of lower motor neuron, situated in the ventral horn of gray matter in the spinal cord; B', axon of lower motor neuron passing to its termination in a voluntary muscle fiber B"; C, cell body and dendrites of supper sensory neuron, situated in the medulla oblongata; C'C', axons of upper sensory neurons, terminating in cortex; c, cell body of lower sensory neuron situated in the dorsal root ganglion; c''', dendrite of lower motor neuron, conducting impulses from the periphery to the central nervous system; c", long axon of lower sensory neuron, conducting impulses toward the brain; c', short axon of lower sensory neuron, conducting impulses direct to ventral horn. (For the sake of simplicity the connection with the cerebellum are omitted.)

Nervous System Diagram

Diagram of nervous system. Labels: a, a, cortex of cerebral hemispheres; b, b, cell body and dendrites…

Anterior view of the heart, dissected, after long boiling to show the superficial muscular fibers. The aorta (b') and pulmonary artery (a') have been cut short close to the semilunar valves. Labels: a, right ventricle; b, left ventricle; c, c, groove between ventricles; d, d', right auricle (atrium); e, e', left auricle (atrium); f, superior vena cava; g', g", right and left pulmonary veins. The fibers are seen running a circular, oblique, transverse, and longitudinal direction.

Anterior View of the Heart

Anterior view of the heart, dissected, after long boiling to show the superficial muscular fibers. The…

"Hydrochloric acid...is placed in the tubes a. The threeway stopcocks b are turned so that there is a passage from c to d and a saturated solution of sodium chloride is drawn from the dishes i into the collecting tubes e until they are filled. The stopcocks are then tunred so that there is a passage from f to d. The current is turned on, and as soon as the hydrochloric acid above the anode is saturated with chlorine, the stopcocks are turned so that the hydrogen and chlorine will pass into the collecting tubes e. When the upper surfaces of the sodium chloride solution are just above the support g, it is inclined, if need be, so as to mark the relative height of the solution in the collecting tubes. the lower support h is then made parallel with g. The solution between g and h is displaced in the same time, showing that equal volumes of hydrogen and chlorine are obtained by the electrolysis of hydrochloric acid." -Brownlee 1907

Electrolysis of Hydrochloric Acid

"Hydrochloric acid...is placed in the tubes a. The threeway stopcocks b are turned so that there is…

"A verticle section of one form of blast-furnace is represented [here]. the crucible (C) is the part of the furnace in which the molten matte and slag collect. The body of the furnace consists of two concentric shells (cs), made either of wrought iron or of steel, between which cold water (W) is caused to circulate to precent the inner shell becoming heated...Pipes called tuyeres (T) enter the furnace a short distance above the hearth...Above the body of the furnace extend the hood (H) and the stack (S). A door (D), used in charging the furnace, is placed in the hood." -Brownlee 1907

Blast-furnace

"A verticle section of one form of blast-furnace is represented [here]. the crucible (C) is the part…

"The region about a magnet in which its magnetic forces can be detected is called the magnetic field. This can be graphically represented by placing a piece of cardboard over the magnet and sprinkling ironn fillings on the paper, gently tapping at the same time." -Hawkins, 1917

Magnetic Field

"The region about a magnet in which its magnetic forces can be detected is called the magnetic field.…

"Action of current on solenoids. To demonstrate this fact experimentally, a solenoid is constructed as shown...Te solenoid is then moveable about a vertical axis, and if a rectilinear current QP be passed beneath it, which at the same time traverses the wires of the solenoid, the latter is seem to turn and set at right angles to the lower current..." -Hawkins, 1917

Current on Solenoids

"Action of current on solenoids. To demonstrate this fact experimentally, a solenoid is constructed…

"Compound motion is that which is produced by two or more forces, acting in different directions, on the same body, at the same time." -Comstock 1850

Compound Motion

"Compound motion is that which is produced by two or more forces, acting in different directions, on…

"Two men carrying a load between them on a pole is also and example of this [second class] kind of lever. Each man acts as the power in moving the weight, and at the same time each becomes the fulcrum in respect to the other." -Comstock 1850

Second-class Lever

"Two men carrying a load between them on a pole is also and example of this [second class] kind of lever.…

"In order that the successive wheels should revolve in the same time, and their circumfrences should be just equal to the length of rope passing between them...By this construction, although the length of rope passing over each was different, yet their revolutions are equal, both with respect to time and number." -Comstock 1850

White's Pulley

"In order that the successive wheels should revolve in the same time, and their circumfrences should…

"This is an instrument designed to measure the quantity of rain which falls at any given time and place." -Comstock 1850

Rain Gauge

"This is an instrument designed to measure the quantity of rain which falls at any given time and place."…

"The most simple refracting telescope consists of a tube, containing two convex lenses, the one having a long, and the other a short, focal distance." -Comstock 1850

Refracting Telescope

"The most simple refracting telescope consists of a tube, containing two convex lenses, the one having…

"If an excited substance be brought near a ball made of pith, or cork, suspended by a silk thread, the ball will, in the first place, approach the electric, as at a, indicating an attraction towards it, and if the position of the electric will allow, the ball will come into contact with the electric, and adhere to it for a short time, and whill then recede from it, showing that it is repelled, as at b." -Comstock 1850

Electrical Attraction

"If an excited substance be brought near a ball made of pith, or cork, suspended by a silk thread, the…

A section across the forearm a short distance below the elbow-joint. R and U, its two supporting bones, the radius and ulna; e, the epidermis, an d, the dermis, of the skin; the latter is continuous below with bands of connective tissue, s, which penetrate between and invest the muscles (I, 2, 3, 4, etc.); n, n, nerves and vessels.

Section Across the Forearm

A section across the forearm a short distance below the elbow-joint. R and U, its two supporting bones,…

The base of the skull. "The lower jaw has been removed. At the lower part of the figure is the hard palate forming the roof of the mouth and surrounded by the upper set of teeth. Above this are the paired opening of the posterior nares, and a short way above the middle of the figure is the large median foramen magnum, with the bony convexities (or occipital condyles) which articular with the atlas, on its sides. It will be seen that the part of the skull behind the occipital condyles is about equal in size to that in front of them; in an ape the portion in front of the occipital condyles would be much larger than that behind them." —Newell, 1900

Base of the Skull

The base of the skull. "The lower jaw has been removed. At the lower part of the figure is the hard…

"Draw out a piece of glass tubing to a jet, and push it through a perforation in a cork that snugly fits a bottle. Slip a short piece of snugly fitting rubber tubing over the outer end of the glass tubing, and insert the cork so that the jet shall project into the bottle. Remove by suction as much air as possible, pinch the rubber tubing tightly, place it under water, and remove the pressure. Something will force the water into the bottle, forming the 'fountain in vacuo' as shown." -Avery 1895

Foutain in Vacuo

"Draw out a piece of glass tubing to a jet, and push it through a perforation in a cork that snugly…

"Pass the tube of an air thermometer or of an inverted mercury thermometer through a cork in the neck of a funnel. Cover the thermometer bulb to the depth of about half an inch with water. Upon the water, pour a little sulphuric ether and ignite it. The thermometer below will scarcely be affected, although the water above may be boiling. Stir the water and note the prompt movement of the thermometer index..." -Avery 1895

Funnel with Inverted Mercury Thermometer

"Pass the tube of an air thermometer or of an inverted mercury thermometer through a cork in the neck…

"Throw a sunbeam through a very small opening in the shutter of a darkened room. Receive the beam upon a convex lens of short focal length, placing a pieve of red glass between the aperture and the lens. Place and opaque screen with a sharp edge beyond the focal distance of the lens, as at a, so as to cut off the lower part of the cone of homogeneous light, and project the upper part thereof upon a screen at b." -Avery 1895

Diffraction

"Throw a sunbeam through a very small opening in the shutter of a darkened room. Receive the beam upon…

"Instrument designed to measure both the rate at which the electrical energy is delivered and the time that it is delivered, i.e., the number of watt-hours." -Avery 1895

Wattmeter

"Instrument designed to measure both the rate at which the electrical energy is delivered and the time…

"When the brass plugs are inserted...the coils are short-circuited, i.e., practically, the whole of a current passing from block to block goes through the plug, but when a plug is withdrawn the current passes through the corresponding coil...By withdrawing the proper plugs, one may throw into the circuit and resistance desired, from a single ohm up to the full capacity of the box." -Avery 1895

Resistance Box

"When the brass plugs are inserted...the coils are short-circuited, i.e., practically, the whole of…

"The arc lamp is essentially a device for automatically separating the carbons when the current is turned on, for 'feeding' the carbons together as they are burned away at their tips, and, in some cases, for short-circuiting the lamp in case of irregularity or accident." -Avery 1895

Arc Lamp

"The arc lamp is essentially a device for automatically separating the carbons when the current is turned…