1st Nov, 2018 12:00
Fine Photographica & Instruments of Science & Medicine
A Steelyard Coin Balance by Benjamin Martin
c.1780, English, Benjamin Martin's 'New Portable Steelyard for Gold Coin', signed 'Martin Fecit No. 4784', static and hydrostatic balance, ivory arm with two-position brass suspension, coin clip, sliding brass weight and blued steel pointer, arm divided on both sides, one side for weighing a guinea, the other divided in shilling values for weighing Portugese gold coins then in circulation, coins weighed in air, then water to determine if base metal, original sharkskin case, length 16cm
c.1780, English, Benjamin Martin's 'New Portable Steelyard for Gold Coin', signed 'Martin Fecit No. 4784', static and hydrostatic balance, ivory arm with two-position brass suspension, coin clip, sliding brass weight and blued steel pointer, arm divided on both sides, one side for weighing a guinea, the other divided in shilling values for weighing Portugese gold coins then in circulation, coins weighed in air, then water to determine if base metal, original sharkskin case, length 16cm
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Auction: Fine Photographica & Instruments of Science & Medicine, 1st Nov, 2018
