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Transactions of the 
great. I cannot decide whether it is more difficult to draw with 
the aid of the appliances hitherto in use, or by the eye without 
them. 
I now introduce to your notice a very simple instrument which 
I have made, and which I think will enable any person, after a few 
hours’ practice with it, to draw with great ease and accuracy. I 
call the instrument a Micro-pantograpli, and the plate which ac- 
companies this paper, and following/description, will enable you to 
understand its construction and mode of application to the micro- 
scope for the purpose of drawing. 
I do not patent the instrument, but freely present it to the 
workers engaged in the cultivation and advancement of micro- 
scopical science. Any microscopist who possesses a little skill in 
mechanical operations may easily make a micro-pantograph for 
himself ; or any optician can make it and adapt it to any microscope 
at a trifling cost. 
Following is a description of the instrument : — It consists essen- 
tially of two parallelograms having their major and minor sides and 
angles respectively proportioned in all positions in which the instru- 
ment can be placed. The major and minor sides rotate freely 
about the centre, or fulcrum, which they have in common, and 
which is fixed to the eye-piece of the microscope, in the focus of the 
eye-lens. A pencil is attached to the major end joint of the instru- 
ment, and a small glass disk, ruled with a micrometer lined cross, is 
attached to the minor or eye-piece end joint, in the position where 
pointers are placed ; and similar focussing of the eye-lens is requisite 
to see both the cross and the object at the same time that is neces- 
sary to see a pointer and object. When drawing, the hand guides 
the pencil which marks the drawing upon the paper, and at the 
same time guides the micrometer cross-lines over the field where 
the object appears in the microscope. 
The drawing-paper, or pad, should be attached to a small table 
(shown in Fig. 2), which is capable of being adjusted to the re- 
quired height for the microscope used, and the top must be made 
to incline to any required angle, according to the position of the 
microscope. 
