The Microscope; An Illustrated Monthly Volume 1

The Microscope; An Illustrated Monthly Volume 1

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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. 1893 edition. Excerpt: ...only danger in this method of working is that the oxygen must be turned on carefully, as otherwise it may be blown round into the mains, and thus extinguish the light at the jet, and form, into the bargain, a pleasant surprise for the next person who attempts to light the gas in another part of the house; but with care this cannot happen. Using ordinary coal gas alone as an illuminant, we have used an Argand burner with fair success, but found it not so good as a Welsbach flame, which is a Bunsen flame playing upon the interior of a cap made of cotton fibre netted and coated with a mixture of metallic salts, chiefly oxide of zirconium. We have also at a press used a common fish-tail burner screwed into the position of the nozzle of the mixingjet. this device being used when we ran short of oxygen, but it is difficult, by this means, to obtain a good enough light to work with any but very low powers. An ordinary paraflin microscope lamp is also available, but is better suited for low powers than high. Day light requires special arrangements scarcely within the reach of ordinary amateurs; a heliostat is needed to keep the sunlight upon the condensers. The heat from this illuminani; must be out off by using arnmonio-sulphate of copper cel. In our our own practice we use a four-inch condenser, out of an optical lantern, to collect the rays from the source of illu.mination, and so arrange it that it throws a converging pencil of rays, the apex of this cone being in the diaphragm of the microscope. When colored screens are used, they are placed between the light and this four-inch condenser, this position having two advantages which are, (1) small imperfections in the glass are of no consequence, (2) and if the flame should spurt sideways it more

Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • United States
  • English
  • black & white illustrations
  • 1236914953
  • 9781236914958