PHILADELPHIA 
The mirror is of unusually large size, giving an increased 
field, and is attached by a graduated axis to the arm. 
The mirror arm is graduated on its upper surface in centi- 
meters and is adjustable in the mounting so that it may be 
brought as close as desired to the prism, extending a distance of 
125 mm., or removed entirely. 
Another feature of importance is the attachment of the 
camera to the microscope by means of a collar with binding 
screw. The collar slips over the tube of the microscope and 
thus permits the placing of the prism at the proper distance from 
the eye lens of the eyepiece. 
No camera lucida qan be used with more than one or two 
eyepieces, which is not provided with a means of adjusting it to 
the focus of the eye lens of the microscope. 
This camera having such adjustment, can be used with all 
our eyepieces with equally good results. 
The eyepiece can be removed and others substituted without 
disturbing the camera. 
No. 2114. Abbe Camera Lucida, as applied to Microscope Tube 
2114. Abbe Camera Lucida^ simpler form $12 00 
This Camera Lucida embodies the same optical construe- 
tion as the No. 21 12, the Abbe prism, mirror and mirror bar 
being of the same dimensions. 
The prism carrier is arranged to swing back from the eye- 
piece by means of a hinge joint. The proper modification of 
the light is secured by colored glasses of different shades, which 
are slipped into slots between the mirror and prism or between 
the prism and eyepiece as desired. 
The prism carrier is attached to the eyepiece by two cap- 
stan-head screws, passing through slots, by which the prism 
may be centered to the eye lens of the microscope. 
This camera may be used with any power eyepiece of the 
compound microscope. 
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