range rake

range rake

[′rānj ‚rāk]
(ordnance)
A T-shaped device with pegs set in the cross; the distance between pegs subtends a definite angle at the base of the T; by sighting with a range rake, a flank observer can get a quick angular measurement of range deviation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.