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��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.
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