Scientific American, volume 40, No. 13, March 29, 1879
Scientific American, volume 40, No. 13, March 29, 1879
Various
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It is one of the best. 4. Will a cotton insulator soaked inparaffine answer as well as silk? A. No, because it renders thecovering of the wire too thick. 5. Can you recommend any insulatingmaterial for making induction coils which will dry rapidly? A. Alcoholic shellac varnish. Rosin to which a little beeswax has beenadded is an excellent insulator; it must be applied in a melted state. 6. What is the composition of the black material covering theLeclanche porous cell? A. Gutta percha. 7. Is th...e magneto-electricmachine described in the SCIENTIFIC AMERICAN SUPPLEMENT patented? A. To which do you refer? Most, if not all of them are patented. (8) B. V. F. Writes: With reference to item 8, on page 139, ofSCIENTIFIC AMERICAN, March 1, 1879, I think there is some mistakeabout the coal you think required to heat 1, 000 cubic feet space. Iburn some 8 tons coal to heat, in the whole year, such part of myhouse as must exceed 25
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