62 Tue MIcROoscoPE. 
the draw-tube moves; D, is the plate-holder and ground glass 
in one frame; a, is the brass strap carrying weight of camera, 
and b, is the binding screw, fixed to immovable point upon the 
stand, its position, of course, varies with the model of micro- 
scope. The binding screw can be made and attached by any 
handy worker in metal. Fig. 2, shows section of fitting of cone 
and draw-tube; a, is the cone; b, is the collar through which 
the draw-tube slides; c, is end of draw-tube projecting into 
cone, for the reception of eye piece; d, is the end of draw, to be 
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| 
inserted into body of microscope. The tube d, should slide 
through the collar b, smoothly, and sufficiently tight to insure 
the exclusion of extraneous light. When in use the camera 
should be raised (so that the collar at b, does not rest upon ‘he 
body of the microscope) and fixed in position by the binding 
screw, this permits a free movement of coarse and fine adjust- 
ment during focusing. In all positions, excepting the hori- 
zontal, light is reflected from the mirror, and is quite satis- 
factory. 
—_—__—~< ¢ >—___—_ 
SHOULD our subscribers have any numbers not necessary to 
complete their files, they will confer a favor upon somebody by 
sending them to this office. Oalls for odd numbers are many 
more than we can supply. 
