On Microscopical Manipulation; A Course of Lectures Dilivered Before the Quekett Microscopical Club, Jan.-Apr., 1869 - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1875 Excerpt: ... NOTES. Microscope Stands. Page 2.--In the Monthly Microscopical Journal,vo. iii., p. 183, Dr. Carpenter gives an account of the " Comparative Steadiness of the' Ross' and 'Jackson' Microscope Stands." The result of his experience under very trying circumstances is decidedly in favour of the latter mode of construction. Immersion Objectives. Page 18.--Object-glasses are now made in which the corrections are adapted for viewing an objefi through water, instead of air as in the usual construction; the advantages are increase of light and improved definition. The drop of water is held by capillary attraction between the front lens and the cover-glass. This system of construction is, of course, only applicable to glasses of short focal length, as the Jth and above. Foreign makers adapt these objectives for use only as immersion lenses. The English opticians have constructed theirs so as to be capable of use either through air or water, by means of an additional front combination, which can be substituted at pleasure for the ordinary one; this plan is a decided advantage, as it gives the power of using the objective in the usual way as well as by immersion. Molecular Motion And Organic Matter In The Air. Page 30.--Papers on " Molecular Motion," by E. P. Joule, LL.D., F.R.S., will be found in the Chemical News, vol. xxi., p. 66, and on "Organic Matter in the Air," by Dr. R. A. Smith, F.R.S., in the same volume, pp. 64, 78. Cutting Glass. Page 35.---The crystal represented in Fig. 13 exhibits several cutting edges besides the one marked a, b. Where large quantities of glass are cut, as in wholesale warehouses, the edge is frequently worn out; the diamond is then re-set, by which one of the other edges is placed in the proper position for cutting. Fig. 46. NOTES. 21...

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