Lot 147
147
An Unusual Early 20th Century Aluminium framed sextant rangefinder, signed and numbered on the nickel silver main arc Stanley London No 7 Patent No 20693, 10in (25cm) radius the main arc graduated for and incised Base Height In Feet and didvided 0-50 thence in 5 foot graduations to 160, the index arm with later compass card in glazed circular compartment and cylindrical range scale graduated in yards from 50-7000 and with tangential pressure arm carrying index mirror, horizon mirror, one erect image telescope and one inverting telescope, the latter with rack and pinion focus, in fitted mahogany carrying case, with brass plaque inscribed Universal Station Keeper and Range Follower Patent No. 20693 - 13¾oin (35cm) wide

Details
An Unusual Early 20th Century Aluminium framed sextant rangefinder, signed and numbered on the nickel silver main arc Stanley London No 7 Patent No 20693, 10in (25cm) radius the main arc graduated for and incised Base Height In Feet and didvided 0-50 thence in 5 foot graduations to 160, the index arm with later compass card in glazed circular compartment and cylindrical range scale graduated in yards from 50-7000 and with tangential pressure arm carrying index mirror, horizon mirror, one erect image telescope and one inverting telescope, the latter with rack and pinion focus, in fitted mahogany carrying case, with brass plaque inscribed Universal Station Keeper and Range Follower Patent No. 20693 - 13¾oin (35cm) wide

Lot Essay

Patent No 20693 was applied for 16th November 1900 and was Accepted 16th November 1901. It was in respect of "A Range Finder and Follower and was granted to William Albert Burns, 2nd Lieutenant in the Royal Garrison Artillery, of Shoeburyness, in the County of Essex, Frederick Nolan Baker, and 2nd Lieutenant in the Royal Artillery, of Shoeburyness aforesaid, and Joseph Lena, Engineer, of 132, Queen Victoria Street, in the City of London. This invention relates to an instrument for finding the range of a distant object, the base height being known, or for finding the range of a distant object the base height being known, or for finding the base height, the range being known, and for enabling any changes in the range to be followed with facility. The instrument is particularly intended for accurately and quickly following and showing changes in the range between moving vessels.

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