Vibration. The movement to and fro of all elements, and by means of which we are made sensitive of the different forces.

Vocation. The business or the calling of a person.

Practical Mechanics for Boys — Part 92

Warding. The act of cutting a projection or guard, such as is usually found on the insides of locks, and the correspondent detent in the key.

Practical Mechanics for Boys — Part 92

Watt. In electricity the unit of the rate of working in a circuit. It is the electro-motive force of one volt and the current intensity of one ampere.

Practical Mechanics for Boys — Part 92

Aluminum, 38, 41, 42, 60, 82, 149, 164, 166, 169, 170, 174, 175, 176, 184.

Angles, 31, 39, 59, 72, 102, 103, 104, 107, 152.

Brass, 41, 43, 44, 168, 170, 174, 175, 176, 184.

Copper, 45, 60, 112, 118, 164, 170, 173, 174, 184.

Cylinder, 39, 40, 66, 80, 90, 134, 135, 136.

Diameter, 52, 126, 140, 143, 144, 148, 149, 150.

Disks, 49, 50, 67, 71, 74, 75, 82, 91, 95, 96, 105.

Drawing, 95, 97, 101, 108, 109, 129, 191.

Files, 36, 48, 50, 52, 53, 56, 59, 60, 114, 167, 168.

Gear, 42, 69, 70, 74, 121, 122, 123, 125, 126, 133, 171.

Horse power, 139, 143, 146, 148, 186, 187.

Invention, 152, 153, 161, 188, 189, 190, 192, 193, 194.

Iron, 42, 63, 155, 162, 165, 169, 175, 184.

Lathe, 28, 39, 42, 45, 64, 65, 67, 104, 171.

Lever, 73, 75, 76, 128, 129, 130, 131, 132, 133, 140, 153.

Power, 128, 129, 130, 131, 133, 134, 140, 158, 159, 186.

Pulley, 68, 70, 73, 128, 133, 140, 149, 150.

Steel, 39, 40, 42, 44, 63, 79, 113, 165, 168, 169, 170, 184.

Tool, 22, 28, 40, 41, 61, 64, 71, 108, 113, 175.

Turpentine, 162, 165, 172, 173, 174, 175.

Water, 165, 166, 168, 172, 183, 186, 187.

Contains an attractive assortment of books for boys by standard and favorite authors. Printed from large, clear type on a superior quality of paper, bound in a superior quality of binders' cloth, ornamented with illustrated original designs on covers stamped in colors from unique and appropriate dies. Each book wrapped in attractive jacket.

1. Cudjo's Cave Trowbridge 2. Green Mountain Boys 3. Life of Kit Carson Edward L. Ellis 4. Tom Westlake's Golden Luck Perry Newberry 5. Tony Keating's Surprises Mrs. G. R. Alden (Pansy) 6. Tour of the World in 80 Days Jules Verne

Contains an assortment of attractive and desirable books for girls by standard and favorite authors. The books are printed on a good quality of paper in large clear type. Each title is complete and unabridged. Bound in clothene, ornamented on the sides and back with attractive illustrative designs and the title stamped on front and back.