212 



Popular Science Monthly 



iron molecules are slow moving and can- 

 not adjust themselves rapidly enough to 

 keep up with the fast alternations of the 

 current. As a result, they jostle one an- 

 other, and heat is developed. 



The man inside this d'Arsonval coil is 

 somewhat like the iron core of the fa- 

 miliar coil. Every 

 cell in his body is 

 being stimulated just 

 as were the mole- 

 cules of the iron core. 

 He feels no pain, be- 

 cause high frequency 

 currents have the pe- 

 culiar property of go- 

 ing through a man 

 without his feeling it, 

 yet stimulating the 

 functional activity of 

 all his cells and or- 

 gans immensely. 



D'Arsonval coils 

 are of particular value 

 in treating hardened 

 arteries and similar 

 afflictions. But this 

 is not the only ap- 

 paratus the electro- 

 therapists now use. 

 X-Ray machines, 

 electric lights, static machines, Tesla coils, 

 vacuum tube electrodes and specialized 

 variations of these are all a part of the 

 regular equipment. 



The young man of electrical or me- 

 chanical bent will find electrotherapy an 

 interesting field. It is as attractive as 



radiotele- ^ 



gr a phy. 

 But the 

 subject 

 should be 

 given 

 sound 

 study. The 

 shallow 

 knowledge 

 of quack 

 doctors 

 brings 

 trouble. 

 Knowboth 

 the medi- 

 cal and the 

 electrical 

 ends well. 



For Recreation Only— Detroit's 

 Innovation in Buildings 



WHAT is said to be the largest estab- 

 lishment in the world set apart for 

 recreation alone, has recently been erected 

 in Detroit, Michigan. The second and 

 third floors are 



The largest building in the world set 

 apaxt for recreational purposes alone 



There .lit twenty two women pin-setters in the ladies' 

 bowling alley which is fitted with every convenience 



equipped with one 

 hundred and five bil- 

 liard tables. The 

 fourth floor is for 

 ladies and has twen- 

 ty-two regulation 

 tournament bowling 

 alleys. All the em- 

 ployees on this floor 

 are women, including 

 twenty-tw^o women 

 pin setters. The fifth, 

 sixth and seventh 

 floors have twenty- 

 two regulation bowl- 

 ing afleys each and 

 offer unusual accom- 

 modations for league 

 and individual 

 matches. There is 

 also a restaurant, a 

 cigar store, soda 

 fountains, a barber 

 shop and a reading room. For exhibition 

 games and lectures, a billiard amphitheater 

 is provided. 



An innovation has been made in the 

 lighting system, which throws a diffused 

 light over the floors devoted to bowHng, 

 the brightest light being shed directly on 



^ the white 



maple 

 pins. This 

 is a great 

 aid in aim- 

 i n g the 

 shot. The 

 alleys are 

 numbered 

 so that the 

 p layers 

 have no 

 difficulty 

 in locating 

 the proper 

 alley from 

 any point 

 on the 

 floor. 



