Popular Science Monthly 



371 



f n the air, the propellers would 

 have to be ver>' strong and 

 the motor by which they 

 would be driven would have 

 to be ver>' light. Their speeds 

 would necessarily be enor- 

 mous. How much additional 

 support the propellers might 

 gain gratuitously by moving 

 ahead and always working in 

 fresh undisturbed air, has 

 never been discovered. Too 

 little is known of helicopters 

 to settle the matter. 



At very high speeds fly- 

 wheels often burst because of 

 the enormous centrifugal force 

 developed. At the high speed 

 with which Mr. Sharpe would 

 have to run his propellers in 

 order to get into the air, 

 equally great centrifugal force 

 would be generated, particu- 

 larlv if all the delicate feather- 



A dose-up view of the proposed machine. The propellers 

 would have to be very strong and the motor light to lift it 



ing mechanism must be exposed to them. 

 Lastly it is to be noted that the front 

 paddle-wheels leave a wake which must 

 be disturbing to the rear pair. 



Let This Machine Teach You 

 How to Play Golf 



DID you ever see a golf coach made of 

 iron rods, a few screws, and a leather 

 pad? If not, look upon the illustration of 

 one invented by Hugh M. 

 Rhind, of Chicago, Illinois. A 

 perfectly good coach is the iron 

 contrivance; for it is warranted • 

 to teach the most difficult 

 and most important ma 

 neuver in playing golf — 

 the perfect "driving" of 

 the ball. 



The secret of the re- 

 markable way in which a 

 real good golf player 

 drives one "great" shot 

 after another is to be 

 found in the fact that he 

 performs the same move- 

 ments for all drives. He 

 has found from experi- - 

 ence that, for instance, 

 by keeping his head 

 stationary until the 

 ball is driven from 

 the tee, and by keep- 

 ing his arms at a 

 certain definite 



The device keeps the golf player's head 

 and shoulders level in order that a 

 correct sight may be readily obtained 



extension and level, he will hit the ball 

 efficiently. Evidently then, it will be 

 necessary for him only to repeat exactly 

 these same movements, and the next time 

 he will make the same wondrous shot, to 

 the great amazement of the onlookers. 



It is on just this simple principle that 

 Rhind's invention works. It teaches a 

 rtian to keep his head still during the 

 downstroke of the drive. The leather pad 

 fits comfortably over one side of the player's 

 head. The iron rods hold 

 ^ the pad firmly in place, 



and the screws allow the 

 pad to be adjusted to fit 

 persons of various heights. 

 The player-to-be plants 

 his head firmly against the 

 pad, and not until he has 

 struck the ball from the 

 tee does he remove it to 

 lunge his body forward. 

 His head and shoulders 

 will then have been kept 

 in the exact position for a 

 perfect sight and a good 

 stroke. After the be- 

 - , ginner has studiously 

 practiced with this de- 

 vise for several suc- 

 cessive rounds of the 

 links, he will be far 

 on his way towards 

 becoming a star in the 

 sport. 



