748 



Popular Science Monthly 



The flexible shaft from the 

 motor rotates the cam. 

 The bearings of the scis- 

 sors shanks, on running in 

 the cam groove, operate 

 the blades of the scissors 



Click! Click! Go These Electric- 

 ally Operated Scissors 



JN large factories where clothing and 

 uniforms are made by the thousands, 

 the cutting of the miles of cloth required is 

 a tremendous job. 



Much of the tediousness of this work has 

 been eliminated by the power-operated 

 scissors invented by John Schultz, of 

 Chicago. 



A rotating groove-cam works 

 the shanks of the scissors back 

 and forth just as the cutter's 

 hand would ply them. The 

 cam, however, rotates so 

 fast that the shank-bear 

 ings, traveling in the 

 turning 8-shaped groove, 

 are moved many times 

 faster than a man could 

 operate them. More- 

 over, the strokes are 

 more powerful, since 

 the electric motor which 

 turns the cam by means 

 of the flexible shaft con- 

 nected with it is several 

 times as strong as a 

 man's hand. 



The scissors therefore 

 can cut several thick- 

 nesses of cloth where a 

 man would cut but one. 



A Simple Cylinder Re- Boring Machine 

 for the Car -Owner 



THE mechanically inclined automobile 

 owner can rebore his engine cylinders 

 in from one-third to one-tenth the usual 

 time and without the services of an expert 

 mechanic, if he uses a simple machine 

 recently brought out in Iowa. Although 

 hand-operated ordinarily, the device can be 

 power driven when much work is to be 

 done in a garage. It will rebore cylinders 

 from 2% to 5-1/16 inches in diameter on 

 engines of either the de- 

 mountable or solid - head 

 types. In the former, the de- 

 vice is bolted to the cylinder 

 after the head is removed, 

 and in the latter to the base 

 of the cylinders when the cyl- 

 inder block is turned upside 

 down. 



The reboring machine con- 

 sists of a top guide block, 

 with a clamp and bolts to at- 

 tach it to the cylinder, and a threaded feed- 

 bar carrying at its lower end a circular cut- 

 ter head slotted for four cutters. The head 

 is threaded inside for the adjustment of the 

 cutters and is tapered on the outside at the 

 bottom to keep the cutting tools straight. 



One 0+ 



four 



cutter 5' 



Head ot cylinder 



CutU, 

 head 



The re-boring machine 

 attached to the bottom 

 of a solid-head cylinder. 

 The cutters and head 

 are revolved through 

 the feed bar 



