Details
Slide and sighting rules:
a gunner's aluminium slide rule by Nicholl & Co., London, dated 1916, in leather case -- 16in. (41cm.) long; a slide rule by Faber; and two boxwood sighting rules in leather cases -- the longest 24in. (61cm.) (4)
a gunner's aluminium slide rule by Nicholl & Co., London, dated 1916, in leather case -- 16in. (41cm.) long; a slide rule by Faber; and two boxwood sighting rules in leather cases -- the longest 24in. (61cm.) (4)