. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. ig8 PHOTO MICROGRAPHY. [CH. carefully, however. This label should contain as far as possible, the following information : (i) Kind of plate ; (2) Time of exposure ; (3) Light used ; ( 4 ) Objective ; (5) Ocular ; ( 6) Magnification ; (7) Name of object and number of preparation from which taken; (8; Date of making the negative. 1?IG. 154. Tripod magnifier. This serves fairly well as a focusing glass, but is inferior to the one shown in Fig- '53- § 339. Low Microscopic Objectives.—Mi- croscopic
. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. ig8 PHOTO MICROGRAPHY. [CH. carefully, however. This label should contain as far as possible, the following information : (i) Kind of plate ; (2) Time of exposure ; (3) Light used ; ( 4 ) Objective ; (5) Ocular ; ( 6) Magnification ; (7) Name of object and number of preparation from which taken; (8; Date of making the negative. 1?IG. 154. Tripod magnifier. This serves fairly well as a focusing glass, but is inferior to the one shown in Fig- '53- § 339. Low Microscopic Objectives.—Mi- croscopic objectives of 35 111111. and greater focal length may be attached to the camera directly after the manner of a photographic objective if one has a plate made with the proper screw for the objective. The only difficulty is in focusing the object properly. If one has the special stand made by the Bausch and Lomb Optical Co., or something equivalent so that the object may be moved with a fine screw, the focusing can be well done. Such an arrangement is also very convenient in using the photographic objectives (Figs. 151-1521 and the apochromatic objec- tives of 35 and 70 mm. focus made by Zeiss. Fio. 155, Engraving glass to serve as a laill's eye condenser. (From the Bausch and Lomb Optical Co.). § 340. Photo-Micrographs of 20 to 50 Diameters.—For these, low objectives are used ( 35 mm. to 20 mm. focus ). They are attached to the camera as described in ^ 339 or a microscope is used. If the microscope is used the object is placed on the stage and focused in the usual wav. The mirror is pref- erably removed or swung aside and the lamp and bull's eve mutually arranged to give an image of the flame as described in S 335- If the object is small the achromatic condenser may be used (See S 34- 1 or one of the Steinheil magnifiers. When the light is satisfactory as seen through an ordinary ocular, remove the ocular. (A) Photographing without an Ocular. - After the removal of the ocu
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