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A brass Dip circle in a glazed case maker's mark E.A Machin &…
Auction House:
Auction Location:
Melbourne
Date:
30-May-2015
Lot No.
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Description:
A brass Dip circle in a glazed case maker's mark E.A Machin & Co., Melbourne, first quarter 20th century with a calibrated circular brass ring and supports, housed in a rectangular case with bevelled glazing, above a circular pedestal on adjustable brass feet, 33 x 25.5 cm note: Ernest A. Machin & Co. Was a prominent manufacturer and retailer of scientific instruments and later, supplier of motoring accessories, based various locations in Melbourne, primarily on Elizabeth Street, from 1907 until the 1960s., the dip cycle was a surveyor's instrument and was used to measure the angle between the horizon and the earth's magnetic field., the measurement was key in helping surveyors to compensate for the effects of the earth's magnetic pull in their other calculations.
Estimate:
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Price:
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Category:
Industry Science & Technology: Surveying