Page:Popular Science Monthly Volume 88.djvu/588

 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

�� �