Anthony Wilkinson was the inventor of this type of folding scale. To operate the scale the turn on the end of the beam is moved to the right for half guineas and to the left for guineas. The slide on the beam will determine how much the coin is underweight (It is obviously never overweight!).
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I served my Scientific Instrument Making Apprenticeship with W F Stanley and expanded my expertise in other companies. I have manufactured, restored, bought and sold scientific instruments for 63 years and I am still active in the business. In 1976 I opened a shop in Bermondsey, London and then went on to trade in the Portobello Road, now I am only selling online. I am a founder member of the SIS Society. I am continuing my scientific instrument restoration business. Email: [email protected]