Popular Srioicc Mouihhj 



513 



fountain and descend again upon the 

 shattered and fast sinking hull of the ship. 

 A few moments later all is over. 



The torpedo, which was laiMched from 

 the tube of a submersible anchored fort, 

 the periscope of which was camouflaged 

 by the barrel, has done its \vork. 



An episode like that pictured here, in 

 brief, would 

 be entirely 

 A\- i t h i n the 

 range of pos- 

 s i b i 1 i t y , 

 should the 

 government 

 adopt the 

 idea of a sub- 

 mersible fort 

 in accordance 

 with the in- 

 vention by J. 

 A. Steinmetz 

 of Philadel- 

 phia, recently 

 patented . 

 The fort, in 

 the form of a turret, 

 provided with a 

 conning tower, may 

 be submerged alto- 

 gether or only so 

 far that the con- 

 ning tower is visi- 

 ble. It is the plan 

 of the inventor to 

 anchor such forts 

 along the coast and 

 near harbor en- 

 trances as a pro- 

 tection against hostile ships. 



'j,.Ur»o.jd ami Viidc-ruo,,! 



Two interesting pictures of "dogs of war." 

 They are used for finding wounded men 



Italian War Dogs Are Well Cared 

 For and Well Trained 



DOGS, at least some dogs, have proved 

 themselves so valuable for military 

 purposes during the present war, that 

 they have been added to the equipment of 

 every army engaj^^ed in the struggle. 



The main 

 purpose for 

 which they 

 are used is 

 the finding 

 of wounded 

 soldiers after 

 an engage- 

 ment or skir- 

 mish in diffi- 

 cult territory, 

 so that they 

 may be car- 

 ried to the 

 field hospitals 

 immediately 

 behind the 

 lines without 

 delay. The dogs 

 employed for that 

 purpose are care- 

 fully trained and 

 well taken care of, 

 as their usefulness 

 depends in a large 

 measure upon their 

 good physical con- 

 dition and their wil- 

 lingness to work. 



Various breeds of 

 dogs have been 



The mech- 

 anism for winding and unwinding the 

 anchor cables, for turning the turret upon 

 the ball-bearings of its anchored base and 

 for launching the torpedoes is controlled 

 from inside the turret and storage bat- 

 teries supply power for the airpumps, and 

 for lighting the crew's quarters. For 

 cases of emergency a supply of compressed 

 air is stored in a pressure tank in the 

 turret. The forts would be self-contained 

 and would carry sufficient supplies to 

 enable them to carry on between the 

 periodical visits of a supply ship. 



tried by the governments of the belliger- 

 ent nations, but only a few of them have 

 been found of value. The dogs shown in 

 the pictures are used by the Italian army 

 in its difficult campaign in the mountains. 

 They are of several different breeds, with 

 the St. Bernard type predominating. St. 

 Bernard dogs have been used in relief 

 work in the high Alps for centuries and 

 have proved themselves hardy, efficient 

 and trustworthy even w^hen working by 

 themselves. The sagacity and courage 

 of the St. Bernards are wonderful. They 

 seem, at times, almost human. 



Those of us interested in science, engineering, invention form a kind of guild. We 

 should help one another. The editor of the POPULAR SCIENCE MONTHLY is 

 willing to answer questions. 



