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 



253 



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. 



