560 



Popular Science Monthly 



A Detachable Motor for Bicycles 



A SMALL motor, developing one 

 horsepower, which may be quickly 

 clamped to the frame of any standard 

 bicycle has been placed on the market. 

 The entire motor, including magneto, 

 muffler and carburetor weighs 

 but fifteen pounds, and the 

 fully equipped motor-bicycle 

 may be picked up and readily 

 carried to any desired resting 

 place. 



The motor is said to be cap- 

 able of propelling the bicycle 



An American manufacturer makes a motor 



which is so light that the whole machine 



can be picked up and carried as easily as a 



standard bicycle 



and rider from two to twenty-five miles 

 an hour. It is of the two-cycle or two- 

 stroke type, which gives an explosion at 

 every revolution of the crank-shaft, re- 

 sulting in a marked absence of vibration. 

 The speed of the engine is controlled en- 

 tirely from one lever on the handlebar, 

 which advances and retards the spark. 



Soda Pulp Has Many Uses 



THE uses of soda pulp have been 

 greatly expanded during the course 

 of the war. Resembling cotton in soft- 

 ness, strength and hghtness, it is being 

 used in the manufacture of explosives 

 and articles of clothing which have 

 hitherto demanded the use of cotton. 



For centuries, Scandinavian countries 

 have lined the walls of their homes with 

 soda pulp. It is a poor conductor of 

 heat and therefore reduces the cost of 



heating; it 

 is airtight 

 and there- 

 f o r e 

 keeps 

 out 

 the 

 wind 

 and 

 cold. 

 I n 

 Ger- 

 many 

 soda 

 pulp 

 is now 

 being 

 sed as 

 overing 

 material 

 for wood- 

 en bar- 

 racks. 



Cellu- 

 lose wrap- 

 ping paper is being made from soda 

 pulp, since its durability and strength 

 have been shown to be very great. 

 It may also be used for foot wrap- 

 pings for soldiers. 



The motor is hardly more cum- 

 bersome than the flat boxes that 

 fit inside the bicycle frame to 

 carry clothes on cycling tours 



The whole motor weighs only 

 eleven pounds, ready to attach 



