Fig. 77
Fig. 78
Fig. 79
Timber Trucks.—Timber trucks ([fig. 78]) are used for carrying timber balks, iron girders, &c. They are usually 3 or 4 feet in length, with a width of about 24 inches and a height of 22 inches. They are made sufficiently strong to carry 6,000 lbs.
Fig. 80
Sack Trucks.—Sack trucks ([fig. 79]) are constructed of hard wood, with fittings of wrought and cast iron and steel axles. They vary in length up to 4 feet 4 inches, and the foot iron projects from 6 to 9 inches.