Page:Popular Science Monthly Volume 92.djvu/269

 Popular Science Monthly

��A Boy Can Lift a Two- ton Car with Tliis Worm-driven Jack

���THE automobile jack, shown in the accompanying il- lustration, was origi- nally developed for lifting freight car trucks for the replace- ment of bearings. It is the first of its type to employ a worm driving member. The jack is char- acterized by two main features, the greater and more uniform power ap- plication secured through the use of the worm gears instead of ordinary

toothed pinions, and a collapsible, univer- sal-ended handle by means of which it may be placed under the car axle so that the car may be lifted without making the operator get out and get under. This is in part made possible by the great power se- cured through the worm gear and worm wheel reduction.

The jack has no springs, pawls or ratchets and is operated through only four working parts, a central rack, a set of two worm wheels, two worm gears on the same shaft to drive the wheels and two smaller pinions, placed one on the back of each wheel. Since the worm gears are integral on the same shaft, power is applied evenly to each side of the central rack, giving an easy and uni- form lifting motion.

���A stout paper bag fits into the street refuse container

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The Dogs Were Hungry and So Tiiey Ate the Cliurch

IN the Hudson Bay country, where the dogs are half wolves, a band of these fam- ished animals actually ate up a church. The Eskimo Christians had built a tiny chapel, to hold twenty people. But the poor ^^^ converts did ^^3 not long en- joy the little church, of which they were so pathetically proud. The building was of whalebone, an edible substance, and one Sunday, the pagan dogs ate every mor- sel of the sacred C^i^S^ edifice.

The Bag Within the Garbage Can. It's Sanitary and Sensible

A STREET garbage can need no longer be emptied by being lifted bodily, while its unsavory contents are thrown into the uncovered cart.

William M. Walsh, of Grand Rapids, Michigan, has invented a heavy paper bag which fits snugly inside the ordinary metal container. The bag is fitted with a draw string at the top, and after it has been filled, it is closed and removed. No unpleasant odors es- cape as the bag is being thrown into the wagon. Moreover, the can re- mains stationary and its surface escapes the un- sightly dents and scars which result from too gymnastic handling.

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