The microscope and microscopical technology : a textbook for physicians and students / by Heinrich Frey ; translated from the German and edited by George R. Cutter, from the fourth and last German edition.

Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: The microscope and microscopical technology : a textbook for physicians and students / by Heinrich Frey ; translated from the German and edited by George R. Cutter, from the fourth and last German edition. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    First quality objectives of lower angular aperture having properly more penetration and better adapted for some anatomical and botanical investigations. 1-Sinch ang. ap. 60° or less $35 00 4-10 85° 40 00 1-4 & 1-5 •' 100° '• 40 00 1-6 100° : 45 00 1.8 1U0° •' 45 00 1-10 •' 100° 45 00 1-13 ' 120° 60 00 1-15 100° ^ 70 00 1.20 100° 100 00 All of l-5th inch or higher powers will be made either dry or immersion at the same price; to work both ways with the same lens, from $5 to $15 extra. With an extra front lens $10 to 2-5ths extra. All the foregoing have Xolles' adju.stment for covering glass, which does not move the front lens. First quality objectives, without adjustment for cover. 4-inch, adjustable to 3-Lnch , $35 00 4-inoh, changeable to 2>^-inch 18 00 * 2-inch 20 00 2-inch, higher ang. ap 23 00 l>^-inch and 1-inch, in one 28 00 1-inch 17° 20 00 1-lnch 25° 23 00 1-inch 30° 30 00 %-vach, new formula, specially flat-field 30 00 X-iuch 25° to 40° ■ 23 00 X-inch, specially constructed for viewing opaque objects 28 00 X-incli, 40° to 70°, adjusting by front lens 26 00 >^-inch, to 70° 35 00 Second quaUty objectives 1-inch and 2-mch $8, 1-2-inch $10, 1-4 and 1-6 $15 to $20 All objectives are made with tiie Society screw, so as to fit all recent BngUsh or American stands—unless ordered otherwise. No. 17.—Price-List of Microscopes and Microscopic Accessories of J. Zent- MAYER, 147 South Uh jStreet, Philadelpliia, Fa. (1872). 1. V. S. army hospital microscope, brass body, 16 inches high, on brass stand, with joint to incline it to any angle, double-milled head, rack and pinion for coarse adjustment, mi- crometer screw tor hne adjustment, movable glass stage ; under the stage a tube is fitted for carrying the accessory illuminating apparatus ; concave and plane mirrors, arranged for direct or oblique illumination; uraw tube for iucreasmg the power; two eye-pieces; one achromatic object glass, of an inch focus of a2 degrees angular aperture; one achromatic object glass, i- of an inch focus of 80 degrees angular aperture (not adjustable for glass cover), giving power of 50, 100, 250 and 450 diameters; camera lucida, stage mi- crometer ruled -j-^-jj- and of an inch, and a condensing lens two inches diameter on separate stand. Securely packed In a neat walnut bo.x with lock and key $135 00 2. Grand American microscope. The most comjjlete and perfect instrument of the kind now made. It is 19 inches high on tripod base. The two brass pillars upon which the body and stage are swung rest upon a revolving plate with graduated edge, by which the angu- lar aperture of the object glasses can be ascertained ; tne body is moved with a douuie- milled head ; pinion and rack for the coarse adjustment, and a fine micrometer screw for the dehcate adjustment. The mechanical stage has a screw adjustment with milled head for the horizontal motion, and a delicate chain and pinion with niiUed head for the verti- cal motion. On the centre of the upper side of the stage a circular plate with graduated edge is attached for measuring angles of crystals; the whole thickness of the stage is but ii, of an inch, but at the same time perfectly solid and steady, and affording unusual fa- cility for great obliquity of illumination svhen difficult tests are to be resolved. Under the stage a small tube with rack and pinion is attached; in tliis tube the accessory illumi- nating apparatus is carried when in use. The muTor has one side plane and the other concave ; the bar which carries it is jointed, to give the required motion for oblique illu- mination. There is a graduated draw tube slitling into the main tube of the body for increasing the magnifying power, by lengthening the distance between the object glass and eye-piece. Three eye-pieces; one achromatic object glass, 1>^ inch focus, 'ii degrees angle of aperture, and one achromatic object glass of an mch focus, SO degrees angle of aperture ; power 50-500 diameters ; large conaensing lens on separate stand. All packed in a handsome walnut cabinet, with lock and key $263 00