Long’s business (posthumous) was at this address from 1885 to 1936.
This appears to be primarily a gauging rule for determining the content of casks whether standing or lying and also functions as a comparative rule.
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The rule is made of aluminium with brass end pieces. When purchased it was minus cursor and a replica of the brass cursor has been made using the scans of a similar rule in Herman van Herwijnen’s archive on Rod Lovett’s website as a reference. This mahogany and boxwood slide rule is 585 mm long and has two slides. Scales A & B in conjunction with C enable the area of a sheet of paper to be calculated. Hudson’s Pump Duty Computing Scale, made by W F Stanley, London, late 19th or early 20th century.