Inventors' & mechanics' scientific manual and patent law complete (1871)
Peck & Miatt, Chicago. [from old catalog] · Chicago, Peck & Miatt · leaf 14
— Wheatstone — an electricspark travels through a copper wire at the rate of 280,000miles in a second. The area of a circle is ascertained by multiplying the squareof its diameter by the decimal .7854, or by multiplying thecircumference by the radius (half diameter) and dividing theproduct by 2.… … 13 PATENTS OF DESIGN. A Patent of design will be grantedto any person without distinction ofnationality who, by his own genius,efforts or expense, has invented orproduced any new pattern for theprinting of woolen, silk, cotton orother fabrics; any original design for a bust, statue, etc.; forany…
Patents
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