J2 



HOW TO PHOTOGRAPH 



The maker of the plates is of little import- 

 ance. The writer has tried most of the 

 makes in the market, and has got good 

 results with all. The chief thing is that 

 the plates be made of good hard gelatine. 

 I f a sample of plate be found to be pre- 



pared with soft gelatine, reject it at once. 

 Frilling may be laughed at, but shrinkage 

 of the film is simply ruin to all good work. 



We come now to the actual exposure of 

 the plate in the camera. First place the 

 object on the stage of the microscopes 



ARRANGEMENT OF MICROSCOPE WITH SHORT CAMERA FOR USB WITH EYE-PIECE. 



A, lamp ; 15, condenser ; C, microscope ; D, short camera ; E, block to support camera. 



choose your lens, and bring the object into 

 focus. Notice carefully the chief points 

 that you wish to be shown clearly in the 

 photograph, that special attention may be 

 paid to them in focussing and exposing. 

 Then lay the microscope in the horizontal 

 position, place the lamp in front, and ad- 

 just the illuminating apparatus in the best 

 position. The object may be seen best 

 with oblique light : in this case be very 



careful, or the plate may not be fully il- 

 luminated, when the negative would be ren- 

 dered worthless. Wnen the illumination 

 has been satisfactorily adjusted, draw the 

 front of the camera up until the eye piece 

 of the microscope fits in the hole made for 

 its reception. A hood of black velvet will 

 probably be necessary to render the con- 

 nection of camera and microscope light- 

 tight. This done, view the object on the 



ARRANGEMENT OF MICROSCOPE WITH LONG CAMERA WHEN THE EYE-PIECE IS NOT USED. 



A, microscope , U. camera ; C, lamp ; D, winch screw ; E, base-board ; F, fine adjustment ; G, band 

 connecting K with wheel of rod, L ; H, block supporting camera ; K, table ; L, wheel of focussing rod ; M, 

 focussing rod ; N, rack and pinion for moving camera front. 



screen, which will be very indistinct. If 

 the adjustments of the microscope are with- 

 in reach, by their means slightly withdraw 

 the lens from the object until the latter is 

 in good focus. If the eye- piece be removed, 

 and the adjustments are, therefore, out of 

 reach by reason of the length of the cam- 

 era, turn the focussing rod until a satisfac- 

 tory focus be obtained. When this is ac- 

 complished, leave the apparatus for a few 



minutes to allow of its expansion from the 

 heat of the lamp. With low powers, this 

 expansion is hardly likely to affect the re- 

 sults, but with high powers is very injurious. 



Sometimes, in fact, when using a high 

 power, the expansion of the metal parts of 

 the apparatus during a long exposure may 

 be so great as to throw the object quite 

 out of focus. It is thus advisable to place 

 the lamp as far away from the microscope 



