194 



Popular Science Monthly 



A Fountain Brush Which Cleans Both 

 Sides of the Teeth 



ANEW toothbrush which can clean 

 both sides of the teeth at the 

 same time — and wash them while 

 cleaning them — has been in- 

 vented by Lincoln C. Stock 

 ton, of Denver, Colorado. 

 The handle of the tooth- 

 brush is hollow and is 

 connected with a bulb 

 filled with water or 

 any cleansing liquid 

 from which the liquid 

 may be discharged in- 

 to the hollow handle 

 and into the head of 

 the brush, which is 

 provided with ducts 

 to carry the liquid to 

 the brushes. 



The brush is operat- 

 ed in the same man- 

 ner as the ordinary 

 toothbrush. There are, 

 of course, two brushes 

 — one to clean the 

 outside of the teeth 

 and the other to clean 

 the inside of the teeth. 

 As the brush is moved 

 back and forth the 

 bulb is pressed from time to time, forcing 

 the water or cleansing liquid to the teeth. 



clean 

 of the 



You squeeze the bulb, 



move the brush and 



both sides 



teeth at once 



UID DENTIFRICE 



VALVE SPRING 



FOUNTAIN SYRING 



A Spinal- Column Harness for 

 Back-Bending Workman 



THE man who invents a substi- 

 tute for the spinal-column, or 

 some sort of contrivance to take the 

 pain out of back bending, will make 

 enough money to buy his wife a car- 

 load of diamond tiaras. 



Evidently Robert E. Kelly, of 

 Cocoanut Grove, Florida, had the 

 diamond tiaras in sight when he 

 invented his spinal-column harness 

 illustrated on this page. Its 

 purpose is to prevent fatigue 

 of the back muscles — so he 

 says. But does it? Hasn't 

 he overlooked the fact that 

 the wearer must perform 

 work in storing up energy in 

 the spring and that he must 

 constantly fight the spring's 

 tendency to bring him into an 

 upright position' 



the 



The invention consists of an elongated 



bar which, between its ends, is twisted into 



a coiled spring on which there is mounted a 



pad to rest against the body. At each end 



of the rod are padded grip-members. One 



of the ends is shaped to straddle the 



neck end of the body and to extend over 



the shoulders; the other end is shaped 



to pass about the legs of the operator, 



exterior to the thigh portions. 



With the aid of its grip- 

 members the brace is able 

 to remain in position 

 on the body of the 

 operator, even when 

 he is standing upright. 

 W'hen the workman 

 I assumes a stooping 



j position the weight of 



the body is in a large 

 measure sustained by 

 the elastic tendency 

 of the brace to assume 

 the straightened-out 

 position. 



Perhaps the inven- 

 tor's idea may be to 

 help the workman to 

 raise up again after 

 he has been bending 

 for some time. We 

 can imagine that he 

 might find some difificulty along that line. 

 •However, "The proof of the pudding is in 

 the eating," and the only way to find out 

 the good qualities of Mr. Kelly's back 

 brace is to try it out. 



Uncle Tom may think he is beating the forces of nature but 

 he isn't f Every time he bends over he has to perform a cer- 

 tain amount of extra work in storing up energy in the spring 



