HORIZONTAL CAMERAS 7 



a bottle and cork adjusted to the right height under the 

 tube. 



The optical axis of the microscope is then taken as 

 the axis of the apparatus, and the block to carry the 

 camera is planed until the centres of the lens aperture 

 and ground glass fall in this line. The means adopted 

 for clamping the camera to its carrier will necessarily be 

 dependent on the form of the camera base. Sometimes 

 screws or turn-buttons can be used, in other cases a piece 

 of wood may be placed over the baseboard and screwed 

 to the block at either side to grip the camera tightly. 



CAMERA WITH SLIDING CARRIERS 



It may be more convenient to provide two blocks for some 

 cameras with long extension, the front and back being 

 carried separately and sliding apart when the bellows 

 are extended. If there is a centre panel three supports 

 may be used. 



Another block is adapted to the lamp. In the figure 

 it will be noticed that this carries a rod on which the 

 lamp slides up and down. The Liliput arc lamp shown 

 is fitted with a condenser, but in other cases it may be 

 necessary to cut a further block for the condenser. 



Arrangement for an Enlarging Camera. The arrange- 

 ment shown in Fig. 2 differs from the first mainly in 



