Popular Science Monthly 



167 



Why need a dentist use both hands? Here the patient is assisting him by holding the 

 mirror and lifting up or pulling down a lip so that he can reach the troublesome tooth 



A Chance for the One -Armed Vet- 

 eran — Let Him Become a Dentist 



SOON after the outbreak of the war, 

 Mr. Frank B. Gilbreth, known the 

 world over as an authority on shop 

 management and motion study, went 

 abroad for the purpose of studying the 

 industrial employment of crippled sol- 

 diers. Nearly every European govern- 

 ment has profited by his investigations. 

 He speedily arrived at the conclusion 

 that while false arms and hands were 

 pleasanter to the sight than mere stumps 

 and while they might even reproduce 

 mechanically with remarkable fidelity the 

 movements of arm and finger muscles, it 

 was far more pracricable to adapt the 

 cripple to his work by teaching him how 

 to utilize what members were still left 

 to him. It is out of the question 

 to ask a poor veteran to supply 

 himself with an expensive artificial 

 arm, and it is humiliating to pen- 

 sion him off and let him 

 while away an idle exist- 

 ence in some parsimon- 

 iously conducted soldiers' 

 home while he is still 

 in the prime of life. 



Accordingly, Mr. Gil- 

 breth has worked out in- 

 numerable methods of 

 enabling a man with a 

 single arm to earn a liveli- 

 hood. In the accom- 

 panying illustrations it is 

 shown that a dentist 

 need not use both hands 



in operating on teeth. Here the patient 

 assists the dentist. He holds the mirror 

 for him or he lifts up or pulls down a lip 

 so that the dentist may reach a tooth. 

 That this is no theory, Mr. Gilbreth 

 has proven by actual experiment. He 

 has had his own teeth filled in the manner 

 shown, not by a one-armed dentist, be- 

 cause there are none, but by one who had 

 one arm tied behind his back and even 

 one eye blindfolded to prove Mr. Gil- 

 breth's point. In a later issue, Popular 

 Science Monthly hopes to take up 

 these investigations of Mr. Gilbreth's 

 more extensively. 



A watch that needs winding 

 only once in every eight days 



An Eight-Day Watch Tells the Date 

 and the Day of the Week 



THE accompanying illustration 

 gives another example of 

 Swiss ingenuity in watchmak- 

 ing. The watch is little larger 

 than those of standard 

 American size. Yet by 

 coiling the thin spring 

 around the interior wall 

 of the case, sufficient 

 energy is stored in it to 

 run the mechanism for 

 eight days. By adding 

 several more gear ar- 

 rangements to the watch, 

 two extra hands are 

 provided which point 

 out the day of the week 

 and even the day of the 

 month. 



