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"Take the zinc from the tumbler of acid and, while it is yet wet, rub thereon a few drops of mercury...replace the zinc in the acid, and notice that no bubbles are given off. Place a copper strip in the solution...bring the strips together at their upper ends as shown. Connect the metals and observe the result." -Avery 1895

Current Electricity

"Take the zinc from the tumbler of acid and, while it is yet wet, rub thereon a few drops of mercury...replace…

"A double convex lens of crown-glass may be combined with a plano-convex lens of flint-glass so as to overcome the dispersive effect for some of the colors without overcoming the converging effect." -Avery 1895

Achromatic Lens

"A double convex lens of crown-glass may be combined with a plano-convex lens of flint-glass so as to…

"If a magnet is cut or broken into two or more pieces, each piece becomes a separate magnet, with north and south poles in the same relative positions as in the original magnet...But if the pieces be pressed closely together, their poles dissapear leaving only the two original poles." -Atkinson 1903

Effect of Breaking a Magnet

"If a magnet is cut or broken into two or more pieces, each piece becomes a separate magnet, with north…

"Effect of breaking a magnet into several parts. If a magnetized needle be broken, each part will be found to be a complete magnet having a N and S pole." -Hawkins, 1917

Separating a magnet

"Effect of breaking a magnet into several parts. If a magnetized needle be broken, each part will be…

"If in a complete metallic circuit having junctions of disimilar metals, the juntions are at different temperatures, then generally a steady current will flow in the circuit as long as the differences of the temperatures of the junction is maintained." -Hawkins, 1917

Seebeck Effect

"If in a complete metallic circuit having junctions of disimilar metals, the juntions are at different…

"The effect of vertical movement in lengthening the effect." —Kinne, 1920

Vertical effect

"The effect of vertical movement in lengthening the effect." —Kinne, 1920

Although vignetting is normally unintended and undesired, it is sometimes purposely introduced for creative effect, such as to draw attention to the center of the frame

Vignetting Camera Attachment

Although vignetting is normally unintended and undesired, it is sometimes purposely introduced for creative…