By: Munn, Orson D.
New York, Scientific American Publishing Company: 1931
Edition: First Edition
Seller ID: 35507807
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 - wo... View More...