Annals of Electricity, Magnetism, and Chemistry; And Guardian of Experimental Science Volume 4

Annals of Electricity, Magnetism, and Chemistry; And Guardian of Experimental Science Volume 4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1840 edition. Excerpt: ...to have such an engine by this riod, and still hopes by next year to accomplish his object--but as not as yet succee ed with one of three-horse power. The question with them will be, --ls it cheaper and better than the methods in common use? It may now be answered---Give it a fair trial: the way is pointed out--practice will no doubt enable you to improve upon the methods which suggested themselves during the experimental investigation detailed in the following pages, and most probably may realise an extended field of practical utility for the peculiar mode of Operation which has been the result. I feel assured, however, that, in the arcana of many trades and branches of art, this process will be found an important addition--supplying as it does a means of producing a cast, or a die, in hard metal, wit/zout the agency of/zeat or pressure, and in extreme perfection and well-defined sharpness. Nor, (I need hardly observe) is its application confined to copper only. ln addition to the applicability of this process, in procuring exact fac similes of coins, or medals, with all the lineal sharpness of the original, perfect copies may be obtained of bronzed figures; nor do they require chasing when taken out--nor do I apprehend inconvenient limitation as regards their size. Assuming it to be advantageous to publishers of music to have their plates in relief', by this process they will be enabled, in the original engraving, to have them so. I have seen nothing in wood engraving that might not be produced in copper, in relief, by this means; the chemical plates might, possibly, require retouching to a small extent, but, with careful manipulation, twenty or thirty such plates might be taken from one mould. I may mention that the advantage of...show more

Product details

  • Paperback | 186 pages
  • 189 x 246 x 10mm | 340g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236874927
  • 9781236874924