Popular electricity magazine in plain English (1913) (14578696007)

Identifier: popularelectric619131chic (find matches)

Title: Popular electricity magazine in plain English

Year: 1912 (1910s)

Authors:

Subjects: Electricity

Publisher: Chicago, Ill. : Popular Electricity Pub. Co.

Contributing Library: Smithsonian Libraries

Digitizing Sponsor: Smithsonian Libraries

Text Appearing Before Image:

rated by endlesschains driven by motors and the craft are carried from one level to the other in re-markably short time. As many as 1,600 boats have been earned through in one day. STUDYING STARS IN AN ARTIFICIAL SKY Within a huge globe at the ChicagoAcademy of Sciences one may see in a few-minutes a representation of 692 of theprinciple stars visible in Chicago duringthe year. To do this by a study of theheavens would require hours of carefulwatching for a whole year. move. The great globe is revolvingslowly. The moon rises and sets and-thenthe sun, both being represented by theingenious use of electric lights. The sphere, which is fifteen feet indiameter, is constructed of thin gal-vanized sheet iron and weighs 500 pounds.^____ The stars are tiny perforationsin the sphere through whichshine outside daylight or elec-tric illumination. Each glim-mering point is accuratelyplaced according to the starit represents in the realheavens. Around the globe on theoutside and on the line of the

Text Appearing After Image:

Huge Sphere Containing an Artificial Sky in which to Study Stars Passing through a door and up a fewsteps the observer finds himself on awooden platform, inside the globe, cap-able of holding fifteen persons. Thedoor closes and everything is dark.Gradually the eyes become accustomedto the darkness and one by one stars areseen in the man made sky. An attendantsnaps a switch and the stars begin to equator is a metal ring to which theglobe is secured and this ring runs ingrooved wheels as the sphere is turnedby an electric motor under the plat-form. The globe, designed by Prof. WallaceW. Atwood of the Academy, cost s$10,000and was presented to the institution byLa Verne W. Noyes. 474 POPULAR ELECTRICITY and the WORLDS ADVANCE 475

popular electricity magazine in plain english 1913 book illustrations history of technology electric power electricity electric engineering high resolution images from internet archive chicago illinois

1913

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