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The gentleman's and trader's guide
Containing, the description and use of a new-invented instrument, for preventing frauds by counterfeit gold, which Gives the Weight, and shews the Alloy of that metal, as well in Coin as in Rings, Jewels, and all Kind of Utensils made thereof; with The Quantity of Adulteration (if any) The instrument Is neatly made in Brass, and very easily portable in the Pocket - Any Person, by sending to the authors, (post paid) may have an Instrument made to Weigh and prove any larger Coin or Utensils of Gold and Silver than This Instrument is design'd for, By W. Bradford, Teacher of the Mathematicks, R. Darby, and J. Hulls. All of Campden, in the County of Gloucester. Sold Wholesale and Retail by the Patentees at their Ware-House in Campden, and in most Towns in England -
An essay on weighing of gold, &c
wherein is shewn an effectual method for discovering and detecting of counterfeit pieces of money, (be they ever so artfully disguise) -
An essay on weighing of gold
&c. wherein is shewn an effectual method for discovering and detecting of counterfeit pieces of money, (be they ever so artfully disguised) Which will be of great Use to prevent Persons being imposed upon by any of those ... and adulterated Pieces of Gold Coin, which are too common at this Time. This is performed by a Pair of common Scales and a Set of Gold Weights, with the Hydrostatical Instrument herein described, which may be had at a very small Expence. By this Method not only Gold Coins, &c. but also all ... of Gold and Silver Plate may be weigh'd, and their ... Value ascertained to the greatest Nicety. By William Symons, Author of The Practical Gauger