£18
Rare antique 1915 boxwood and brass alidade/vernier sight rule made by Aston and Mander Ltd London the rule is single-sided boxwood with brass endplates with sighting slots that hinge up 90 degrees and are attached with four screws each. There are two scales, one on each beveled edge. One is 12 inches long and calibrated in inches 10ths and 50ths, the other scale is 2 inches to 1 mile and is calibrated 0 to 10,000 yards. Used for military gun laying and survey use.
41cm l
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