Page:Popular Science Monthly Volume 89.djvu/695

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Popular Science Monthly


��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


Air Holes



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��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.

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