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The Vector Ruling Protractor

Albert Francis Zahm

出版	National Advisory Committee for Aeronautics, 1924
URL	http://books.google.com.hk/books?id=aYI-AQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

The theory, structure and working of a vector protractor is presented in this report. This instrument is used for determining a vector in magnitude and position when given its components and its moment about a point in their plane.