A Manual of Optical Instruments

A Manual of Optical Instruments

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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. 1850 edition. Excerpt: ...with a precision and celerity that may truly be termed magical. To those who would avoid the disagrimens of sitting for their portraits, and to those who have strong conscientious scruples respecting the propriety of paying fifty or sixty guineas to a Royal Academician for that painful privilege, the Daguerreotype tenders its amicable services. A little sunshine, with the following simple directions, will enable any one that is inclined to practise this pleasing art. speedily to command a wide circle of admirers. CLEANING THE PLATE. The articles necessary to be provided for this operation are as follows: --clean and fine cotton wool, calcined tripoli, prepared lamp-black, rouge, (jeweller's, ) velvet buff, spirit lamp and stand, pair of stout pliers. Light your spirit lamp, take your plate with the pliers securely hy one of its corners, and hold it over the lamp copper side downwards in a slanting position, so that the flame of the lamp may equally heat the whole of the plate; after having held the plate thus for a few seconds, you will see its bright surface gradually change, small specks and a whitish film appearing on the silver, when this takes place the plate has been sufficiently heated, and must be allowed to cool gradually on the stand. While it i thus cooling, prepare your calcined tripoli, a small quantity of which must be mixed with a little distilled water, in. a cup or other convenient vessel; when the plate has sufficiently cooled, take a piece of cotton wool formed like a small pellet, supporting the plate meanwhile on the fingers of the left hand by pressing the edges of the same, without allowing' the fingers to touch the bright surface, which would grease it, and neutralise your previous efforts. Having the plate...
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Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • United States
  • English
  • black & white illustrations
  • 1236818520
  • 9781236818522