59 Tue Microscope. 
in performance, though somewhat expensive. In my own prac- 
tice, a lamp with large flat reservoir containing a large quantity 
of oil, and using a duplex burner is employed. This is carried 
upon a heavy retort stand, which allows the lamp to be placed 
at any desired height above the platform and secured there by 
means of athumb screw. The edges of the flames are turned 
toward the stage of the microscope, and by means of a bulls- 
eye condenser on stand, (as shown also in illustration,) a very 
brilliant illumination of the object may be obtained. Indeed 
so powerful an amount of lightis thus concentrated upon it, that 
I never employ any further substage or achromatic condensers 
with powers under ith or {th inch; whilst for those under one 
inch, no condenser at all is used, the direct rays from the lamp, 
(reduced by means of the sub stage diaphragm,) giving better 
results than are obtainable by the use of a condenser; although 
requiring rather lengthened exposures. 
The form of camera, just described, is adapted only to the 
making of negatives. Quite recently I have improved upon it 
with additions that render it a complete enlarging, reducing and 
copying camera, whereby lantern slides of the best quality may 
be made from } sized negatives, much better than by contact 
printing. The accompanying illustration and a brief description 
will clearly show the construction of this improved box. 
Walmsley’s Photo-Micro Enlarging, Reducing, and Copying Camera. 
In all respects this improved camera is the same as that 
just described with the following additions. To the middle di- 
vision of the bellows, a board is attached by a turn-buckle, 
which carries a rectilinear photograph lens; access to which is 
obtained by means of a light-tight door in the box, (as shown 
in the illustration.) This portion of the bellows body may be 
