758 



Popular Science Monthly 



Brushing Away the Tacks 



A 



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. 



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. 



A 



A Sled for Lawn- Sprinklers 



N arrangement 



iOj^mm 



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. 



