Popular Science Monihly 



11 



N 



A Portable Dental Ambulance for 

 Treating the Fighter's Teeth 



.T the beginning of the war, the dental 

 surgeon, so far as the Allies were 

 concerned, was not officially recognized 

 in army circles. Indeed, it was not until 

 the Germans marched into Brussels, with 

 a dental post every ten kilometers, that 

 the Allies appreciated the importance pf 

 oral hygiene. 



To-day there are eleven American 

 dental field ambulances in France alone. 

 Men, who were formerly sent home on 

 sick leave, whose only trouble was their 

 molars, are now kept at the front. 

 Soldiers, to the number of a 

 division and a half have thus 

 been spared to the army. Fur- 

 thermore, the surgeons insist 

 that a wounded man with bad 

 teeth makes a slow recovery. 

 And then, too, army rations 

 are hard to masticate, so that 

 the man with poor teeth 

 "bolts" his food and loses strength and 

 endurance. In our new National Army 

 there will be a dentist for every five hun- 

 dred men. 



The accompanying illustration shows 

 a portable dental ambulance used in 

 several National Guard camps. 



Screen in raised position 



Hinge 



© Int. Film S rv. 



Twenty per cent of the injuries the soldiers re- 

 ceive are face and head wounds, which require 

 dental treatment as well as surgical attention 



The protective metal screen 

 permits the typist and no one 

 else to see what she is writing 



At the left the screen is shown 

 raised. It can be adjusted 

 to any make of typewriter 



Foiling the Busy-Body with a 

 Letter Screen 



CURIOSITY often impels persons to 

 read letters which have been left 

 in the typewriter in a partly finished 

 condition. Business secrets and informa- 

 tion of a confidential nature 

 are thus very often divulged. 

 A simple and effective rem- 

 edy is offered in a de\'ice 

 patented by Henry R. 

 Knowles, of Rudley Park, 

 Pennsylvania. It consists of 

 a metal screen, hinged through 

 its center and fastened to the 

 carriage of the machine. It is 

 adjustable to any make of 

 typewriter. By raising the 

 forward part of the screen, the 

 typist may read the letter or 

 make corrections when neces- 

 sary. When released, the 

 screen will drop of its own 

 weight and completely cover 

 the letter in the machine, with 

 the exception of the last two 

 lines, which the typist can see 

 from a sitting position. These 

 lines can not be read by any- 

 one standing behind or in 

 front of the machine. 



