Keyword:A very interesting issue. Features: Triangulation - why and how this precise surveying job is done; Editorials - The Nicaragua Canal - The "R-101" disaster - Spiritism exposed - Why a navy is needed - Sick railroads - Lessons learned; Our changing transportation - competitors to the railroads; Zone television and the television arc - television transmission via three channels; Tudying up the constellations - archaic method of outlining roups is being simplified; Problems of calendar improvement - the importance of the movment ot change our calendar; Tons of human hair in industry - woven into press-clth

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Scientific American June 1931 Volume 144 Number 6

By: Munn, Orson D.

Price: $199.95

Publisher: New York, Scientific American Publishing Company: 1931

Edition: First Edition

Seller ID: 35507807

Binding: Paperback

Condition: Good