I opular r>cience Monf/ili/ 



He Outswims the Ducks in ^ 



His New Diving Dress 



ON a recent gray Saturday 

 afternoon, in London, the 

 fussy little tugs and launches were 

 puffing about their business on 

 the Thames, and every now and 

 then a lumbering Thames barge 

 would pursue its un- 

 beautiful bullying way 

 down the river. The 

 whistles were hooting, 

 and a few gulls wheeled 

 about, picking up 

 scraps from the oily 

 water — in short, it was 

 just a regular, misty, 

 gray London after- 

 noon. Suddenly, 

 though, there was a 

 shouting and a cran- 

 ing of necks, and the 

 sleepy river life be- 

 became immediately 

 vAde awake. A man 

 had jumped into the 

 river from one of the 

 boats. Was it an at- 

 tempted suicide? Had 

 he gone over to rescue some one? The 

 black, murky waters swallowed him up. 

 He bobs up. The river men could hardly 

 believe their eyes. He had reappeared 

 with a two-bladed paddle, and was 

 propelling himself along! It all proved 

 to be a demonstration of the new David- 

 son life-sa\'ing suit. 



This costume is made on the same 

 principle as a di\dng-suit. It is both air- 

 inflated and waterproof. Air-chambers 

 are pro\ided in the body portion and in 

 the leg portions, 

 and these may be 

 blown up by the 

 mouth, through 

 suitable tubes. 

 The dress can be 

 inflated in forty 

 seconds. A belt 

 around the middle, 

 together with ad- 

 justing the amount 

 of air in the various 

 chambers, serves 

 to regulate the 

 equilibrium. 



809 



The service stamp to be affixed to your 

 letter to inspire your friends with your 

 own sense of duty to flag and country 



Properly inflated — but not 

 with self-conceit — you can 

 paddle yourself along com- 

 fortably in this union suit. 

 All you have to do is to in- 

 hale as much air as possible, 

 then exhale it through the 

 tube into the costume. In 

 other words buoy yourself 

 up with your own hot air 



This shows a man properly 

 equipped for a trip that is 

 apt to lead him into a tem- 

 porary sojourn in the water. 

 The suit is air-tight, and if 

 he has enough breath left 

 to inflate himself he can 

 -^ keep afloat for a long while 



The Service Stamp is the Latest 

 Patriotic Device 



IN these days of rapid introduction of 

 various kinds of new stamps it is not 

 surprising to hear of the service stamp. 

 These stamps are made in sheets of one 

 hundred \^dth one, two or three stars, 

 as circumstances require, and are de- 

 signed for use in the same way as the 

 Red Cross seals. The cost of a sheet of 

 one hundred stamps is negligible. 



' Affix one of these 



stamps to your let- 

 ter, and thereby 

 give your friend a 

 hint that you have 

 endeavored to ful- 

 fil your duty to 

 your country; it is 

 bound to be a re- 

 minder to him if 

 in any small partic- 

 ular he has been 

 remiss in that meas- 

 ure of duty which 

 we owe our country. 



