Page:Popular Science Monthly Volume 92.djvu/183

 Popular Science Monthly

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���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.

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