| No. 105. | The Photo-micrographic Apparatus consists of a heavy iron
foot supporting a stout column in which another iron support
moves vertically. This latter holds the camera and may be firmly
fixed at any height by means of a thumb-screw. This permits the
accurate adjustment of the camera to microscope stands of various
sizes. The length of the camera is also adjustable by means of a
thumb-screw sliding in the upright support. Regulation of the
field of the camera is accomplished by a revolving disc diaphragm
with openings of five different sizes situated in the neck of the
camera. Two simple plate-holders for plates 9×12 and 13×18 cm are
supplied with each camera, as are also a ground glass plate and
clear glass plate in the frame of the camera serve to catch the
picture in the plane of the photographic plate, and a simple lens
aids in obtaining a correct focus of the image. A white glass
plate, mounted on a stand is of use in diffusing direct sunlight
so as to make it available for photographic purposes, and three
discs of yellow, blue and green glass are provided which may be
inserted over the iris-diaphragm of the condenser when colored
light is required. It is of great advantage to interpose an illuminating lens between the source of light and the mirror, thereby condensing the light-rays, giving a uniform illumination and preventing the heating up of the entire stand, which is a disturbing factor in retaining the focus. The illuminating lens also serves to lessen the time of exposure. This photo-micrographic apparatus is also available when it is desired to photograph gross specimens as, for example, embryos, insects, etc., by reflected light, as is represented in the figure on p. [86]. The photographic objective of 64 mm focal distance, is best adapted to this purpose. It fits in a collar in the neck of the camera and yields a magnified image of about 3 diameters. The object is brought into proper focus by means of a small stand, the table of which may be raised or lowered as required. Price of the apparatus without microscope stand | $40.— |
| No. 106. | Small stand for supporting specimens to be photographed by reflected light as mentioned above | $4.75 |
| No. 107. | Welsbach lamp with reflector | $6.— |
| No. 108. | Illuminating lens of 100 mm diam. on stand | $12.— |
| No. 109. | Photo-micrographic apparatus, for use in horizontal and
vertical position. It is in construction similar to the
foregoing, but is provided with joint for inclination and
clamping lever, and can be used at any angle. Large size bellows and plateholder, for plates up to 24×24 cm. Moveable platform with three leveling screws and clamping-bar for holding stand. Price of the apparatus, with 2 simple plate-holders, ground and plain glass plate, etc., without microscope stand | $60.— |
Photo-micrographic Apparatus No. 109.
Edinger's Projection Apparatus.
Edinger's Projection Apparatus with Nieser's Photographic Camera.
| No. 110. | Edinger's Projection Apparatus—For projecting and drawing
large objects slightly magnified. (Cf. Zeitschrift für wissensch.
Mikroskopie. VIII. 1891.) A polished wooden base, in which a lime wood drawing tablet is inlaid, supports a wooden stand which in turn holds a horizontal metal tube in which are a collecting lens and a reflecting mirror. The upright also carries, two arms, by rack and pinion adjustment, the one supporting the object stage, the other regulating the length of the camera. On the other side of the upright is a support for a lamp. The rays of this lamp are converged by the collecting lens upon the mirror, are reflected downward to the object and through the objective to the drawing board below. The various adjustments permit considerable variation of magnification with the same objective. Price, including lamp | $18.— |