671. Expensive Apparatus Not Essential

Expensive Apparatus Not Essential. For the student or household an expensive outfit is entirely unnecessary. Any ordinary microscope with a good solid base, and containing a fairly fine focusing rack and pinion, will answer almost every purpose. With such an instrument a two-thirds or one-sixth objective may be employed. However, the low-power two-thirds objective will prove the most serviceable, and a one-sixth is really unnecessary.

672. For botanical studies the two-thirds objective is the only one for the student to use. This stand fitted with the Schriever Microscopic camera makes the outfit complete. A reproduction of this outfit is shown in Illustration No. 121 and the camera can be procured from the American School of Art and Photography, Scranton, Pa.

673. Practical Outfit For The Physician Or Naturalist

Practical Outfit For The Physician Or Naturalist. While for this outfit a very elaborate camera may be employed, with long extension bellows and tilting stand for working upright or horizontally, yet for all practical purposes the camera attachment shown in Illustrations Nos. 120 and 121 will answer, and by its use the very best of results can be obtained. For the more advanced or for physicians' use a better microscope, however, is required, but the same camera may be employed. For this purpose we recommend, and include in this outfit, the stand, BB8, manufactured by the Bausch & Lomb Optical Company, Rochester, N. Y. This is a standard instrument for every kind of work. It is a very necessary requirement for the use of low and high-power lenses, and is, therefore, universally used by physicians. In this outfit is included a two-thirds, a one-sixth and also a one-twelfth oil-immersion objective.

674. The stand is fitted with both coarse and fine focusing adjustments, an Abbe condenser with Iris diaphragms being also supplied. The instrument is supplied with plain and concave mirror, extra large, adjustable vertically on a swinging arm for focusing the mirror and to secure oblique illumination. The pillar is made with a joint for inclination, and with a stop for holding the body exactly horizontal when inclined. A reproduction of this complete outfit is shown in Illustration No. 120, Fig. 1.

675. Description of Outfit, Illustration No. 120. - a, is the microscope; b, is the ground-glass screen; c, camera attachment; d, the plate-holder; e, carrying case for the microscope; f, eye-piece. These are the principal attachments to which we will refer in the instruction to follow.

676. Supports For Instruments

Supports For Instruments. It is important that the instruments be placed on a solid, level support, which is perfectly rigid, to avoid any movement whatever, for the slightest movement will interfere with the obtaining of perfectly sharp results. A good, solid, heavy table will answer every purpose.

677. The Dark-Room

The Dark-Room. One of the indispensable accessories in connection with photo-micrography is the darkroom. While this room need not be very large, it must be absolutely light-tight, and for comfort should be well ventilated. To make it more complete, it should have running water. An ordinary closet can be arranged to advantage. Where the work is done at night any ordinary room which can be made absolutely dark will answer. For the physician his regular office or consulting-room fills every requirement. In the consulting-room, or some side room, a very neat closet can be fitted up by partitioning off one corner of the room. This dark-room need not be larger than 3x3 feet.

678. Dark-Room Equipment - For convenient working the dark-room should contain the following paraphernalia, or its equivalent: 4 rubber trays, 4x5; 1 rubber fixing box, 4 x 5; 1 zinc washing box, 4 x 5; 1 small negative rack; 1 dark-room lamp (developing lantern); and regular developing chemicals, depending upon the developing formula employed. The dark-room lamp should be of good size and well ventilated. The Ingento ruby lamp is well equipped with all requirements. It is large, having a door on each side, one side containing a ruby light which supplies the illumination by which you may develop the plates. The other side has a ground-glass for exposing the developing papers and examining the plates after they are developed and fixed. Either gas, or kerosene oil, or electric light can be used as the illuminant in this lamp. The front section has three removable 7 x 9-inch glasses, ruby, orange and brown, thus securing any quality of light, and the lamp is of ample proportions to avoid over-heating. If kerosene oil is used, ventilation is provided for to prevent an offensive smell. When using the lantern for developing, the flame should be kept quite low. This will not only prevent over-heating, but provides against fogging the plates during development. For complete information for dark-room see Volume II.