To retard or arrest motion (revolving or rectilinear).
[35]. Strap and lever brake. The strap is usually faced with wood or leather, but sometimes is used without either. Wood is liable to become noisy. Leather gives the best grip. Iron upon iron, or wood upon iron is not safe if liable to become oily or wet.
[36]. Block and lever brake. Wood or cast-iron blocks are used.
[37]. Compound block and lever brake; avoids putting cross strain on the shaft—used on winding engines, &c.
[38]. Internal toggle brake, employed for friction clutches. See [Section 15]. The inner ring is turned to fit loosely inside the outer ring and split, the toggles being arranged as shown to expand the ring till it is locked to the outer ring.
[39] & [40]. Double block and lever brake on wheel rim grips the wheel rim between the lever stocks or jaws. The strains are self-contained.
[41]. Disc brake; considerable end pressure is required with this form, and must be arranged for in the bearings of the shaft.
[42]. Compound disc brake. Several discs may be employed, sliding on feathers on the shaft.
[43]. Fan brake; may be run openly in air, or enclosed in a drum with water, oil, or other liquid. (See Allen’s patent Governor, &c.)
[44]. Spring brake, acting on a small grooved pulley; for light purposes.