n front of it with a wheelon a tapering shaft carrying a barrel correspondingly tapered to fit Wackerman, of Warren, Pa. snugly on the shaft. On the opposite end of the shaft te Loads on Roofs, is aratchet wheel, and on the like end of the bar- The load to which a roof is exposed is of two kinds:… … equal weights at the apex and the purline the direction of motion of this ratchet and WACKERMAN’S IMPROVED SNOW PLOW. point, but half only at the foot of rafter. In the arrangement of its teeth, the ratchet will short, at the apex and purline point the loads slip over the teeth on the jaw, and fail…
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