1782 



Journal of Applied Microscopy 



LABORATORY PHOTOGRAPHY. 



Devoted to Methods and Apparatus for Converting an Object into an Illustration. 



A FORM OF VERTICAL CAMERA AND ITS LABORATORY 



USES. 



I have recently attempted to 



Fig. 1. — The camera has been re- 

 moved from the sliding frame to 

 show the latter in its supports. 

 The wooden rod for focusing the 

 catnera is seen at the right. The 

 rope seen hanging down is used 

 in pulling down the snaffle at the 

 end of the counterpoise rope, in 

 order to attach it to the camera 

 frame. 



photograph the eggs of Amia at a magnification 

 of 10 to -*0 diameters. These eggs are some 

 2 mm. in diameter, spherical and opaque, and 

 must be photographed under liquid with a 

 vertical camera. 



Two chief difficulties have been met with. 

 If objectives of long focal distance be used, 

 such as the 70 mm. of Zeiss or the SO mm. 

 of Leitz, the short bellows of the vertical 

 cameras ordinarily supplied by the makers 

 does not permit of sufficient magnification. 

 If objectives of shorter focus be chosen, suffi- 

 cient magnification is obtained, but with a loss 

 of focal depth so that the resulting negative 

 shows a part of the object out of focus. 



The apparatus here described was devised 

 to overcome these difficulties. It permits the 

 use with the microscope of a vertical camera 

 of a maximum length of 1.5 meters. The 

 apparatus was afterward found to be of use 

 without the microscope, i. e., in the ordinary 

 way with photographic objectives, and is of 

 especial value for photographing objects in 

 liquids or objects which for any reason cannot 

 be placed in a vertical position in front of the 

 ordinary camera. 



The camera used is the Larger Photomi- 

 crographic Camera of Zeiss (No. 235 in the 

 English Catalogue of Instruments and Appli- 

 ances for Photomicrography and Projection, 

 3d edition, 189S). The more recent forms of 

 the same camera would answer as well. 



This camera is made in two sections so 

 that the front section alone may be used 

 where a short bellows is desired. The camera 

 is attached by means of clamps to an iron 

 frame, consisting of two iron rods held together 

 by cross bars at the ends and middle. By 



