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POPULAR SCIENCE MONTHLY. 



Janes, Lewis G. Our Nation's Peril. 

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McLellan, J. A., and Ames, A. F. The 

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Patten, Simon N. The Development of 

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Pittsburg Press Almanac, The, for 1899. 

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Recejac, E. Essay on the Basis of the 

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ffragmeuts of JfctettJCje. 



The Ncrnst Electric Lamp. — Prof. Wal- 

 ter Nernst, of the University of Gottingen, 

 has recently devised an electric Limp which 

 promises to be an important addition to our 

 present methods of lighting. The part of 

 the lamp which emits the light consists of a 

 small rod of highly refractory material, said 

 to be chiefly thoria, which is supported be- 

 tween two platinum electrodes. The rod is 

 practically a nonconductor when cold, but by 

 heating it (in the smaller sizes a match is 

 sufficient) its conductivity is so raised that a 



current will pass through it ; after the cur- 

 rent is once started the heat produced by the 

 resistance of the rod is sufficient to keep up 

 its conductivity, and the latter is raised to a 

 state of intense incandescence, and gives out 

 a brilliant white light. As the preliminary 

 heating by means of a match or other flame 

 would in some cases be an inconvenience, 

 Professor Nernst has devised a lamp which, 

 by means of a platinum resistance attachment, 

 can be started by simply turning a switch. 

 The life of the rods is about five hundred 



