Popular Science Monthly 



423 



A Motion -Picture Projector Which 

 Can Be Carried in a Suitcase 



TO meet the present growing de- 

 mand for educational and in- 

 dustrial motion pictures, a Chicago 

 manufacturer is marketing a portable 

 motion-picture projector weighing 

 about twenty-one pounds and no 

 larger than a small suitcase. 



The new projector has been 

 developed to meet all the require- 

 ments for the projection of mo- 

 tion pictures on short notice and 

 under conditions which are very 

 often unfavorable for projection. 



A brilliant light for the pro- 

 jector is produced by a triple set 

 of condensers and a nitrogen- 

 filled bulb. Hence, although the 

 regulation celluloid film is em- 

 ployed, there is no fire danger. 

 The picture may be stop- 

 ped and held stationary at 

 any point without the 

 slightest injury to the 

 film. With this new con- 

 denser arrangement, elec- 

 tric current supplied from 

 any convenient socket will 

 throw an excellently il- 

 luminated picture any- 

 where from eight inches to 

 eight feet wide, it being 

 necessary only to lower 

 the window shades in the 

 classroom or office. 



The mechanism is 

 driven by hand and 

 may be reversed at 

 any time during the 

 display without 

 adjustment, since 

 the feed and take-up 

 reels are arranged side 

 by side and are both 

 revolved by a single 

 sliding belt. Their 

 operation in either 

 direction merely re- 

 verses their order of 

 winding. 



In threading the 

 projector, the film is 

 led under a sprocket 

 on the right of the 

 machine head. A 

 semi-twist of the film 



The twenty-one-pound 

 portable projector is no 

 larger than a small suitcase 



brings it into proper The film enters the exposure gate at the 



position. left and is led to the take-up reel at right 



From Beer to Clay! What's Be- 

 come of the Breweries? 



MR. F. J. HASKIN told in the 

 Chicago Daily News recently 

 what has become of some of the 

 breweries in states that have gone 

 dry. They are used for cold storage 

 warehouses, canning clams, 

 making vinegar, handling dairy 

 products, making artificial 

 ice, packing meat, making 

 yeast, dry cells, soap, chemicals, 

 moving picture films, paints, 

 varnish and "everything from 

 ice to loganberry juice." One 

 has become a hospital and 

 another a church. 



The Coors brewery at Gold- 

 en, Col., was famous for its 

 size and its beer, but nothing 

 could save it against the dry 

 wave. So one of the Coors 

 brothers took over the plant 

 and is now doing a thriving 

 business in malted milk. 



Another brother had pre- 

 pared himself as a chemist to 

 follow the brewing industry, 

 and when that became impossi- 

 ble he undertook to help out in 

 an investment that seemed to 

 be going wrong. There was a 

 clay deposit out there and a company had 

 been formed to make tableware from 

 it. Coors Senior had put a great 

 deal of the family money into the 

 industry. But things were not 

 going right; the man who started 

 the business had wandered away 

 and there were problems in re- 

 search that had not been mas- 

 tered. 



Now from ferments to clay is 

 quite a jump for a chemist, but if 

 his grounding is good the difficulty 

 is half overcome before he begins. 

 At all events, after the junior 

 Coors was fairly started in the 

 work the trouble began to 

 fade away. They are now 

 turning out a grade of 

 laboratory porcelain 

 that finds a ready 

 market and will make 

 the German ware 

 hard to introduce 

 again in this coun- 

 try after the war is 

 over. 



