Popular Science Monthly 



927 



A Small Refrigerator Suitable for 

 the Milk Bottle 



"\ yTAXY a baby has 



died of colic or 

 summer complaint simply because 

 the milk it received was not kept at a tem- 

 perature low enough to 

 prevent the development 

 of bacteria in it. In 

 an ordinary ice-box the 

 thermometer usually reg- 

 isters from 55 to 6p de- 

 grees, Fahrenheit; but to 

 be safe milk should be 

 kept below 40 degrees. 



In its effort to better 

 conditions for babies the 

 Department of Health 

 of New York city has 

 planned a milk refriger- 

 ator which any mother 

 may make for herself. 

 If you want to try one 

 of these model refrigera- 

 tors, this is how to do it: 

 Get a wooden box from 

 your grocer — any box 

 will do provided it is 15 

 deep. Buy a covered 



earthenware 

 crock large 

 enough to hold a 

 quart bottle of 

 milk. Next get 

 a strip of lino- 

 leum or oilcloth 

 I ft. wide and 3 

 ft. long. Sew the 

 ends of the strip 

 together and you 

 will have a cylin- 

 der which will fit 

 loosely around the 

 crock. Put a layer of sawdust or excelsior 

 in the bottom of the box; place the cylinder 

 in the center of the box with the crock in 

 it and then pack the excelsior or sawdust 

 all around them. Nail a few old newspapers 

 on the inside of the top of the box and your 

 refrigerator is ready for use. 



As soon as you receive the milk in the 

 morning (do not wait until it gets warm) 

 crack five cents' worth of ice and place it 

 around the milk bottle which you have 

 put into the crock. Cover the crock and 

 close the lid down on the box. This will 

 keep the milk near the freezing point no 

 matter how hot the day. Take the crock 

 from the box every morning to pour oflF the 

 water. — A. M. Jungmax. 



The crock in the box with ice 

 packed around the milk bottle 



Detecting Leaks in Inner Tubes 

 by Means of Smoke 



WHILE in India recently I entered a 

 motorcycle contest, which was of the 

 town-to-town type. It was from Calcutta 

 to Gya, a distance of 300 

 miles, over roads which 

 were covered with small, 

 sharp-pointed stones, old 

 shoes, nails and other 

 things such as are to be 

 found where there is bul- 

 lock traffic of the eastern 

 type, all of which are 

 liable to make small 

 punctures. Not being 

 able to procure water to 

 test my tubes and locate 

 minute leaks, I took a 

 pocketful of cigarettes 

 along with me and found 

 the following method a 

 wonderful time and tem- 

 per-saver as well as the 

 only means of finding 

 such punctures. 



The defective tube is 



taken out and the valve 



removed. Then 



A wood grocery box and an earthen crock, some lino- 

 lexun, paper and excelsior make a milk refrigerator 



two or three 

 mouthfuls of 

 smoke are puffed 

 into the tube, 

 after which it is 

 inflated as much 

 as possible. The 

 smoke will 

 be seen to ooze 

 out of any punc- 

 tured place. The 

 spot can then be 

 sandpapered and 

 dressed while the smoke is oozing out and 

 locating the place for the repair patch. 

 After the patch is applied the valve is 

 again taken out to let the remainder of the 

 smoke escape and the tube is ready for use 

 again. — George Thornton Norris. 



Cementing Tire Reliners to 

 Make Them Hold 



BEFORE cementing reliners, the paint 

 on the inside of a tire should be scrap- 

 ed off. If possible turn the tire inside out, 

 a part at a time, and buff with a power- 

 driven brush. Neither gasoline nor other 

 liquid preparations should be used. They 

 gum up the surface and consequently make 

 good work impossible. 



