登入選單

返回Google圖書搜尋

On the Investigation of Instrumental Errors of Universal and Transit Instruments by Means of Autocollimation

Reiner Schwebel

出版	Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force, 1970
URL	http://books.google.com.hk/books?id=ajmdlJlqVbkC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Geodetic astronomy depends to a certain degree on the precision of available instruments. This investigation covers the instrument errors that effect the determination of a horizontal direction and the effect of these errors on position accuracy determination by horizontal angle measurements and vertical transits. The following errors were investigated: (1) axis errors; that is, horizontal, tilt and target axis (2) instrument errors; that is, divided circle, micrometer, and level bubble and heat deflection of the telescope. These errors seldom exceed + 1 minute. Three common first order instruments, the Wild T-4, Kern DKM-3, and the Askania AP70 were investigated. The direct investigation of the instrumental errors was conducted utilizing very precise auto-collimation methods, and statitical methods for defining the type and magnitude of the errors.