658 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
For vertical photography the entire apparatus is arranged as in 
fig. 161 (the illuminating apparatus is not properly arranged), the screw 
support is lowered to the maximum (40 cm. fall), the camera is rotated 
to the horizontal position, then raised to the proper height, and the slide 
is pushed forward until the camera is over the Microscope. The further 
arrangements can he seen from the figure. 
The inventor gives five reasons why the apparatus, in practice, offers 
certain advantages over those larger forms of apparatus which are divided 
between two tables. 
(1) The apparatus, when once centered, may be moved by means of 
the rollers to any point desired. 
(2) It may be used equally well in the horizontal or vertical 
position. 
(3) It may be adjusted to any height convenient to the observer 
without disturbing the alignment. 
(4) The entire apparatus may be centered to an independent source 
of light (sunlight, &c.) without disarranging the alignment. 
(5) It takes up less floor space than the larger apparatus. 
The inventor finds, after a year’s experience, that no bad effects from 
vibration have been noted. Kohler’s method of illumination is in process 
of adaptation. The idea of mounting on screws and rollers has occurred 
independently, but later, to the firm of Zeiss, who are applying it to some 
of their instruments. 
Fig. 162. 
P 
Reichert’s Low-Power Photomicrographic Apparatus. — The appa- 
ratus shown in fig. 162 is intended for low-power photomicrography, 
where a planar or colinear lens o b is used instead of an ordinary Micro- 
scope objective. The stage P, holding the object, is placed in a vertical 
position on a horizontal table. The object is brought into focus by 
moving the stage to and from the lens by rackwork ; a pinion head 
