Page:Popular Science Monthly Volume 88.djvu/786

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��Popular Science Monthly

��Brushing Away the Tacks

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��R E V O L V-

ing brush has been devised for sweeping aside small objects likely to puncture an automobile tire. Attached to the axle is a frame- work, holding the brush and two gear-wheels. The small gear-wheel engages with cogs on the rim of the automobile wheel; and the large gear-wheel operates the brush, thus rotating the brush in an opposite direction to that of the moving tire.

This Toothbrush Can Be Used Only Once

THE bristles of this novel toothbrush are made of some ma- terial which be- comes soluble upon application of wa- ter. After having been used once, the toothbrush is use- less, and a new one must be provided. A suggested composition of the bristles is a mixture of antiseptic formaldehyde tooth powder, paper pulp and an adhesive of an antiseptic or sanitary nature.

A Lamp for the Motorist's Glove

EXTENDING the arm to one side as a warn- ing to drivers be- h i n d is w e 1 1 - enough in the day- time. At night some other ex- pedient is neces- sary. To over- come this difficulty a new device has been patented consisting of a glove with a small electric light fitted into the back near the wrist. The contact points are on the index finger and the thumb so they can easily be brought together. The wires pass through the glove between the inner and outer layers.

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���Keeping the Cow's Tail Out of the Milk Pail

TO prevent a cow from switching her tail while being milked, a large, heavy clip is made of some metal, preferably iron or steel. On the inside of each block of metal, forming the faces of the clip, is a groove which receives the tail comfortably. A suitable spring holds the two faces of the clip tightly together. With the heavy clip on the end of her tail, the cow is unable to switch it freely.

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��A Sled for Lawn- Sprinklers

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���for holding the nozzle of a hose used in spraying consists of a sled- like framework with two upright pieces having grooves for the re- ception of the noz- zle. Over one groove or notch is a clamp for securely fastening the hose. Just in front of the mouth of the nozzle is pivoted a spoon-like spreader or deflector. A thumb-screw makes it possible to adjust this part at any desired angle.

Does This Solve the Refilling Problem for Fountain Pens?

IN order that a solid ink may be used in a fountain- pen, and in order that the ink may be renewed without soiling the fingers, a small receptacle is made to screw into the upper end of the barrel. When the cap protecting this upper end is removed, a pellet or stick of solid ink is dropped into the receptacle, and the other end of the barrel is filled with water.

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