Inventors' & mechanics' scientific manual and patent law complete (1871)
Peck & Miatt, Chicago. [from old catalog] · Chicago, Peck & Miatt · leaf 6
m that aside from our regularcharges in doing their work, we will gladly, and withoutcharge, be of any assistance that we can in adding to, orinforming them in any respect about, their devices. Ratio of the hardness of metals: Iron, 1 ; platina, 2;copper, 3 ; silver, 4 ; gold, 5 ; tin, 6 ; lead, 7.… … NATURE AND EFFECT OF A PATENT. When one has perfected, in hisown mind, some design of utilityor beauty, the first thought is,I ought to be rewarded for thishonest and skillful work, whichis of such real worth. Thisresult of the employment of mybrain and time ought to bepaid for by those who…
Patents
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