216 



Popular Science Monthly 



An Electrical Wind Waves this 

 American Flag on its Pole 



THE sight of a Hag 

 waving from its staff 

 in a seemingly quiet at- 

 mosphere in Atlantic City 

 recently puzzled everyone 

 who saw it. Only after a 

 careful examination of the 

 flag and the pole did it 

 become apparent that the 

 pole was really blowing 

 the flag. 



The pole was a metal 

 tube twenty-seven feet 

 high and five inches in 

 diameter at the top and 

 nine inches at the bottom. 

 It was set over the ex- 

 haust port of an electric 

 motor-driven blower, 

 hidden from view by 

 foliage. For a distance 

 of nine feet from the top, 

 the pole was perforated 

 with two rows of holes 

 drilled close together. 

 With the blower in opera- 

 tion it was the blasts 

 emitted through these 

 holes that held the flag 

 and imparted to it the 

 waving motion shown in the illustration. 



A Simple Method for 

 Pasteurizing Milk 



ONE of the most important contributions 

 from the medical profession has been 

 the simple process of pasteurization. We 

 can only realize what it has meant when 

 we consider that of all the dairy cows 

 in the United States, forty per cent 

 have tuberculosis. It is therefore 

 evidently very important that every 

 bottle be pasteurized before being 

 used ; and if that has not been done by 

 the dealer, it can be effected without 

 much trouble in the following way: 

 The bottles are placed in a wire 

 basket and slowly heated in a vessel 

 of water to just boiling. Here they 

 are left for five minutes; then they are 

 again cooled by allowing cold water to 

 run into the vessel. The bottles must 

 then be stored at a temperature of 

 not more than fifty degrees Fahren- 

 heit. If the temperature should be 

 just about fifty degrees, wet woolen 

 cloths will lower it enough. 



The pole blows the flag whether 

 there is any air stirring or not. 

 The effect is the same even indoors 



You Can See Your Gasoline 

 in This Service Station 



ANEW departure in gas- 

 oline service stations 

 for automobilists has been 

 invented by Henry E. 

 Maurer, of Springfield, 

 Illinois. The patented 

 device includes a system 

 for the accurate measure- 

 ment and dispensing of 

 gasoline which allows the 

 motorist to see the gas- 

 oline that he is receiving. 

 Furthermore the dealer 

 does not have to turn the 

 crank of his pump as each 

 gallon is measured out. 

 1 he entire apparatus is 

 operated by the vacuum 

 process and eliminates 

 any possibility of mistake 

 in giving an accurate 

 measurement. 



When the motorist 

 drives up to the station 

 he receives his gas from 

 two five-gallon glass 

 tanks. These tanks are 

 marked with gages that 

 are inspected at intervals 

 and sealed by the in- 

 spector. As the gasoline flows out of the 

 glass receptacle the motorist is given a 

 chance to see exactly what and how much 

 he is getting. The flow is automatic. 



by opening 

 to the jar. 

 other fills. 



The gasoline is released 

 a valve, which admits air 

 Whileone jaremptiesthe 



There is no guesswork in measuring your gasoline 

 with this device. You can see for yourself by 

 watching the gages how much you are getting 



