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The gentleman's and trader's guide. Containing, the description and use of the new-invented instrument, for preventing frauds by counterfeit gold, improved; which now gives the weight, and shews the alloy of that metal, as well in coin as in rings, jewels, and all kinds of utensils made thereof, with the quantity of adulteration, (if any) more readily than that first publish'd

0000; Gale Group; Linguagem: English

Bradford, William, teacher of mathematicks,

"Any person, by sending to the author, may have an instrument made to weigh and prove any larger coin or utensils of gold or silver, than this instrument is design'd for." Abstract of His Majesty's royal letters patent: p. [1]-[2]. Advertisements (5 p.) at end. Book.