his sys- engraving on the first page discloses the secret of this impor- erations. tant revolution. It shows how completely the multifarious tematic exactness, three grades of gages are used ; the first The efforts that have been made from time to time in Eu- operations of this delicate craft are… … Firing the Dials. ing the factory was a littie boy making screws. At first we could not conceive what he was doing, for the screws it represents but one department of the establishment. Single + he made were so fine that it takes nearly a hundred tools, which gradually grew into simple hand…
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