azimuth-adjustment slide rule

azimuth-adjustment slide rule

[′az·ə·məth ə¦jəs·mənt ′slīd ‚rül]
(engineering)
A circular slide rule by which a known angular correction for fire at one elevation can be changed to the proper correction for any other elevation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.