92 



expensive in the lives of many splendid 

 young men. 



W'hat is the remedy for this shocking 

 condition ? During the present session of 

 Congress there must be an appropriation 

 which will insure the purchase of a great 

 number of new machines. \\'hen we 

 have at least five hundred machines as a 

 start in the right direction, then, and not 

 until then, will the Pensacola Aeronau- 

 tical Station be of real benefit and be 

 worth the money that has been spent on 

 it. 



With the requisite number of efficient 

 aeroplanes, and money enough to main- 

 tain flying schools, the aviators of our 

 Army and Navy will have to confront 

 only the ordinary dangers incidental to 

 flying, "which they are ready and willing 

 to face. 



Photographs of the War 



THE photography of the war has 

 been, until recently, one of the 

 great disappointments of modern jour- 

 nalism. In the first months of the great 

 conflict, few pictures of any real interest 

 filtered through the hands of the censors, 

 but since the beginning of the second 

 year, American photographers have man- 

 aged to find their way to the fronts and 

 have taken pictures which while inocu- 

 ous in the eyes of the censor, had that 

 striking news value which has made 

 American journalistic enterprise the cri- 

 terion of the world. 



In the first rank of these photogra- 

 phers is Albert K. Dawson, of Brown & 

 Dawson, Stamford, Conn., whose picture 

 of a German 42-centimeter cell which 

 pierced the walls of a Przemysl fort but 

 failed to explode, is one of the most 

 striking war photographs to reach this 

 country. This photograph, which as pub- 

 lished in our November issue, was mis- 

 takenly credited to Underwood and Un- 

 derwood, but the credit of the achieve- 

 ment should go to Brown & Dawson, 

 who copyrighted the picture. 



Hearing the Stones on a River's Bed 



A MICROPHONE installed in a 

 sounding lead is used in taking 

 soundings to determine the character of 

 the Ohio river bed. An armored cable 



Popular Science Monthly 



leads from the microphone to the traw- 

 ler, terminating in a telephone receiver 

 and dry batteries. The ship is propelled 

 at a rate of from two to six miles an 

 hour. When the sounding lead drags 

 over the mud bottom, a dull groaning 

 sound is heard in the receivers, while a 

 stony or pebbly bottom will cause a se- 

 ries of sharp, staccato raps. 



Brightening the Baby's Path 



FRANK PEIRCE, of Edwardsville, 

 111., an electrical experimenter, de- 

 vised a way of lighting the path for 

 his baby's buggy. He thought of the 

 plan when the baby objected to riding 



'y 



An electric light in the hood of his 



carriage brightens this baby's way at 



night or in the evening dusk 



in the dark and being jolted about be- 

 cause of striking unseen objects. The 

 light and reflector of a flashlamp are 

 arranged in the top, a four-volt light be- 

 ing used and giving about sixty candle- 

 power. It is connected with two dry 

 cells in the bottom of the baby carriage, 

 under the seat. 



The light throws a ray fifteen to 

 twenty feet ahead of the buggy. It 

 may be easily adjusted to keep the 

 rays from the child's eyes at all times. 

 A plug and socket arranged in an incon- 

 spicuous place is used to light and shut 

 cfif the current. 



