12 



'. /tyJtY:WE STUDY SCIENCE 



/M^';g: ^ogress: in "science recent. Have you ever 

 triougM how ma'riy'tKrrigs have come into common use since 



your father and mother 

 were born? X-rays, 

 flash lamps, radium, 

 the pianola, liquid air, 

 submarines, gas en- 

 gines, sky scrapers, 

 harvesters, vacuum 

 brakes, fireless cookers, 

 vacuum bottles, vacu- 

 um cleaners, street 

 cars, airplanes, hydro- 

 planes, motor cycles, 

 gas mantles, automo- 

 biles, carpet sweepers, 

 asphalt paving, safety 

 matches, pneumatic ap- 

 pliances, moving pic- 

 tures, typewriters and 

 adding machines, wire- 

 less telegraphy, pneu- 

 matic mailing tubes, 

 electric heating and 

 cooking apparatus, tur- 

 bines, paper towels, 

 electric lighting, reen- 

 forced concrete, sani- 

 tary drinking fountains 

 and cups, and a great 



A triumph of modern science. How many scien- many Other things 

 tific inventions can you think of which are prob- , . . 

 ably utilized in this large office building ? WnlCn WC JiaVC COlTl&-tO 



