702 



Popular Science Monthly 



properly trimmed or not. It is this 

 system of installation which will give 

 indication in the pilot-house or engine- 

 room when the ship springs a leak. It is 

 also possible to tell after the ship springs 

 a leak whether the pumps are taking care 

 of the inrush of water or not. By 

 means of an electrical attachment to the 

 mercury indicator, warning bells can be 

 rung when a dangerous height has been 

 reached by the mercury column, or, in 

 other words, when the ship is listing in 

 any quarter. 



The possible uses of the pneumercator 

 are almost limitless. It can be employed 

 in oil fields, at hydroelectric plants, on 

 warships, on gasoline engines and, in 

 fact, any place where accurate pressure 

 gages are necessary. 



A pneumercator is installed on the 

 U. S. S. New York for indicating the 

 amount of oil in the auxiliary tanks. 



A New Way of Driving a Bicycle 

 with a Motor 



ONE of the most ingenious motor 

 attachments for bicycles yet placed 

 on the market has recently appeared in 

 England. The motor, which develops 

 slightly over one horsepower, is attached 

 to the luggage-rack; it weighs but six- 

 teen pounds and occupies little space. 



new place for the bicycle motor 



A V-shaped belt-rim is attached to the 

 back wheel, and on this fits a friction- 

 wheel, which is chain-driven from the 

 motor. A lever operated from the 

 handlebar lifts this wheel from the rim, 

 and thus provides a free engine and clutch. 



The motor is said to develop sufficient 

 power to drive the machine at the rate of 

 twenty miles an hour, although on a 

 steep hill, the rider must help the motor 

 by pedaling. 



The makers assert that they can place 

 this little machine on the American 

 market at a cost of about fifty dollars. 

 The expense of operating will probably 

 be small, as the engine is designed to run 

 nearly one hundred and fifty miles upon 

 one gallon of gasoline. 



This electric fixture can be easily attached 

 to any bed 



Reading in Bed Made Easy 



^N electric light device which can be 

 attached to any bed directly over 

 one's head has recently been put on the 

 market. A strip of brass is bent into 

 nearly a circle at one end, the other end 

 being bent in the opposite direction to 

 form a large hook for hanging over the 

 headboard. 



An ordinary electric socket is fitted 

 with a short threaded tube having a 

 flange at its outer end. This tube passes 

 through a longitudinal slot in the brass 

 strip and is held in place by a spiral 

 spring which presses against the flange 

 and the inner surface of the curve. The 

 length of the slot permits a wide angle 

 of adjustment of the light. This simple 

 device may be easily attached to a desk 

 or any other piece of furniture where a 

 light is needed. 



