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"If light from a highly luminous body is admitted to a darkened room through a small hole in the shutter and ther received upon a white screen, it will form an inverted image of the object." -Avery 1895

Image by Aperature

"If light from a highly luminous body is admitted to a darkened room through a small hole in the shutter…

A screw used with nuts, driven into tapped holes.

Machine Bolt

A screw used with nuts, driven into tapped holes.

"The capstan, in universal use, on board of ships, is an axle placed upright, with a head, or drum, A, pierced with holes for the levers B, C, D. The weight is drawn by the rope E, passing two or three times round the axle to prevent its slipping. This is a very powerful and convenient machine. When not in use, the levers are taken out of their places and laid aside, and when great force is required two or three men can push at each lever." —Comstock, 1850

Capstan

"The capstan, in universal use, on board of ships, is an axle placed upright, with a head, or drum,…

A Hollow is a land form where land falls on all sides to a minimum point.

Hollow

A Hollow is a land form where land falls on all sides to a minimum point.

A locust laying eggs.

Locust laying eggs

A locust laying eggs.

"a is the sphere, placed in half-holes on the axis bb, so that when its principal axis is parallel to the axis the telescope it gives only one image of the object. In a direction perpendicular to that axis it must be so placed that when it is moved by rotation of the axis bb the separation of the images shall be parallel to that motion. The angle of rotation is measured on the grduated circle C. The angle between the objects measured is = r sin 20, where r is a constant to be determined for each magnifying power employed." —The Encyclopedia Britannica, 1903

Micrometer

"a is the sphere, placed in half-holes on the axis bb, so that when its principal axis is parallel to…

"a is the sphere, placed in half-holes on the axis bb, so that when its principal axis is parallel to the axis the telescope it gives only one image of the object. In a direction perpendicular to that axis it must be so placed that when it is moved by rotation of the axis bb the separation of the images shall be parallel to that motion. The angle of rotation is measured on the grduated circle C. The angle between the objects measured is = r sin 20, where r is a constant to be determined for each magnifying power employed." —The Encyclopedia Britannica, 1903

Micrometer

"a is the sphere, placed in half-holes on the axis bb, so that when its principal axis is parallel to…

"Argent, a mullet pierced, sable, on a chief azure, three mullets pierced, of the first. PIERCED OR PERFORATED. Cut through the centre." -Hall, 1862

Mulllet Pierced

"Argent, a mullet pierced, sable, on a chief azure, three mullets pierced, of the first. PIERCED OR…