Page:Popular Science Monthly Volume 91.djvu/439

This page needs to be proofread.

Popular Science Monthly


��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.

�� �