[Fig. 60] is adapted for a narrow belt. The lacing commences at one margin hole (A), and terminates at the other margin hole (Z)
[Fig. 61] shows the outside of the belt.
[Fig. 62]. Gears.—This is something every boy ought to know about. [Fig. 62] shows a pair of intermeshing bevel gears. This is the correct term for a pair when both are of the same diameter.
Miter Gears.—In [Fig. 63] we have a pair of miter gears, one being larger than the other. Remember this distinction.
[Fig. 64]. Crown Wheel.—This is a simple manner of transmitting motion from one shaft to another, when the shafts are at right angles, or nearly so, without using bevel or miter gears.
[Fig. 65]. Grooved Friction Gearing.—Two grooved pulleys, which fit each other accurately, will transmit power without losing too much by friction. The deeper the grooves the greater is the loss by friction.
[Fig. 66]. A Valve Which Closes by the Water Pressure.—The bibb has therein a movable valve on a horizontal stem, the valve being on the inside[p. 70] of the seat. The stem of the handle has at its lower end a crank bend, which engages with the outer end of the valve stem. When the handle is turned in either direction the valve is unseated. On releasing the handle the pressure of the water against the valve seats it.