Popular Science Monthly 



081 



A Novel Device for Generating Fresh 

 Air in Submarines 



ANEW process for supplying pure air 

 to submarines has been discovered. 

 The inventor, William G. Bond, of 

 Wilmington, Del., recently demonstrated 

 the use of his apparatus by remaining in 

 a test chamber three feet b)' four lecl 

 by six feet for se\'en hours with oni\' 

 the air furnished by his de\icc. The air 

 is purified by a chemical reaction 

 between carbon dioxide and certain 

 solutions exposed to the atmosphere of 

 the chamber. The carbon is absorbed 

 and the oxygen liberated. 



The test room used was entirely 

 surrounded by water. Mr. Bond en- 

 tered the tank, clad in a bathing suit 

 and supplied with reading matter, food, 

 air-testing apparatus and the chemicals. 

 He kept in communication with the 

 observers on the outside by means of a 

 telephone. At a stated time, the supply 

 of oxygen furnished by the apparatus 

 was cut off and he remained for three- 

 quarters of an hour longer. Though 

 the air had been perfectly wholesome 

 for seven hours, at the end of the 

 forty-five minutes the inventor emerged 

 breathing very heavily. 



The value of this discovery to the 

 submarine is yet undetermined. Its 

 advantages are the simplicity of opera- 

 tion and the low cost of installation and 



An electric lantern is cleaner, cheaper, and 

 gives a much brighter light than kerosene 



Electric Hand Lantern Costs Less Than 

 a Kerosene Burner 



AX electric hand lantern has just 

 . been placed on the market for 

 ])eople who have a use for the hand 

 lantern, but who find most of them too 

 expensive. It sells for the sum of 

 twenty- five cents and gives as good a 

 light as many of the more expensive 

 models. The lamp proper is a tungsten 

 burner which is turned on and off by a 

 screw. It is six inches high. 



To^/ower Fan 



3otLiTion 



Air Holes 



Ull 



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~\ Cfiarnn:als f~ 



The air in a sealed 

 chamber is maintained 

 constantly fresh by a 

 series of chemical re- 

 actions between the 

 carbon dioxide 

 breathed out and cer- 

 tain solutions which 

 are exposed to the at- 

 mosphere of the room 



maintenance. Let it be said, howewr, 

 that any practicable method for ventila- 

 tion of the submarine will be welcomed. 



Electric Ranges Are Be- 

 coming Popular 

 OXE of the most prom- 

 ising de\"elopments 

 ot the present time is the 

 increasing use of electric 

 ranges in the home. This 

 is especially true in Canada 

 where the rates are remark- 

 ably low. In man\' cities, 

 the price per kilowatt-hour 

 is less than three cents, and 

 in some it is as low as one 

 cent. The main objection 

 lies in the fact that an elec- 

 tric stove installation is ex- 

 pensive. Tearing out old 

 wiring and replacing it with 

 new is almost as costly as 

 the range itself. Thus the best and most 

 economical plan is to make the proper 

 installation when the house is first built. 



