CAMERA LUCIDAS. 
No. 3370 
No. 3370. Abbe camera lucida ... se a ae a bee dee ws fee 
This apparatus is made for the production of correct drawings of images seen through the 
microscope. It consists of a prism mounted to fit over the eyepiece of the microscope and a large 
mirror placed a few inches from it. The prism is silvered but has a small clear aperture in its 
centre. The paper upon which the drawing is made is reflected by the mirror into the prism and 
in turn by the silvered surface of the prism into the eye. At the same time the object is seen 
through the clear aperture in the prism. Thus the object is seen superimposed upon the paper 
and can be readily drawn. This Abbe camera lucida is of rigid design and is made of a light 
metal, so that the total weight is 7 oz. The fitting carrying the prism is hinged and can there- 
fore be readily turned aside when not desired for use, or for changing eyepieces. A series of 
neutral tint glasses for equalising the light in the two fields are mounted in a revolving fitting. 
The microscope should preferably be used vertical, but if inclined, the drawing paper must be 
set in the same plane as the stage. 
No. 3371. Simple form of Abbe camera lucida ... {3 3 0 
The large mirror is replaced by an adjustable prism. With this 
form, a lens is supplied to bring the pencil and paper into focus 
at a distance of about 10 ins., which in this case is the approximate 
distance between the eyepiece and paper. A neutral glass is also 
supplied. 
No. 3368. Beck horizontal camera lucida ... Pre we ee bret) 
This again gives an image of the paper by means of a prism, 
but it is constructed for use with the microscope placed in a hori- 
zontal position. The image of the paper is reflected into the eye by 
a half silvered surface on the prism and the object is at the same 
time viewed through this half silvered surface. A compensating 
lens and neutral glass are supplied 
No. 3369. Beck vertical camera lucida sie ree sO 
This is constructed on similar lines to the horizontal pattern 
but is made for use with the microscope in either an upright position 
No. 3369. or at 60° inclination. 
No. 3375. Drawing table, adjustable for angle, for use with camera 
lncidas. *.2 ex. a KoA wah ay sop LO UO 
)4 
