Details
An electrum, steel and ivory drawing set,
by WATSON & SON, in plush-lined rosewood case -- 8in. (20.3cm.) wide; an aluminium military-pattern artillary slide rule, engraved Dring & Fage London, 1917, No. 549, in leather case -- 19in. (48.2cm.) long; and a brass roller rule, in pine case -- 19in. (48.2cm.) long (3)
by WATSON & SON, in plush-lined rosewood case -- 8in. (20.3cm.) wide; an aluminium military-pattern artillary slide rule, engraved Dring & Fage London, 1917, No. 549, in leather case -- 19in. (48.2cm.) long; and a brass roller rule, in pine case -- 19in. (48.2cm.) long (3)