DEC 11 1901 
MONTHLY MICROSCOPICAL JOURNAL. 
JULY 1, 1872. 
I . — On a Micro -'pantograph . By Isaac Roberts, F.GLS. 
( Taken as read before the Royal Microscopical Society, June 5, 1872.) 
Plate XXI. 
Dr. Beale, F.R.S., in his treatise on ‘How to Work with the 
Microscope,’ says : — “It may be truly said that no real advance 
in our knowledge of the minute structure of animal or vegetable 
tissues can be communicated to others, unless accurate drawings are 
made.” . . . “We may feel sure that those who follow us will 
respect our drawings, if honest copies of nature, although very little 
of what is now written will be read some years hence.” These 
statements will be accepted as truisms, and yet how few are the 
observers with the microscope who can draw at all, not to say draw 
truthfully. 
This defect is not to be wondered at, for the difficulties are 
EXPLANATION OF PLATE XXI. 
Fig. 1. — The letters E, A, O, anti N, indicate parts of the micro-pantograph. 
E is the glass disk, with micrometer cross-lines ruled upon it. It is cemented 
over a small hole drilled through the centre of the rivet which forms the joint at 
the minor extremity. A is the centre or fulcrum round which the instrument 
freely moves. O is one of the major limbs. N is the drawing-pencil holder. It 
is placed over a hole which is drilled through the rivet which forms the joint at 
the major end. Z is the eye-piece of the microscope. M is a slit cut into the 
side of the eye-piece, into which slit the minor end of the micro-pantograph and 
the support shown under E, A, Fig. 1, are inserted and firmly fixed. To draw 
any object it is only necessary to place the end of the pantograph in the slit of 
the eye-piece ; place the eye- piece in the microscope ; adjust the height and incli- 
nation of the drawing table and paper or pad to the plane of the pantograph, and 
with the right-hand forefinger and thumb guide the drawing pencil with a slight 
pressure over the paper, at the same time looking through the eye-piece at the 
object and guiding the centre of the micrometer cross-lines over the respective 
parts of it, and an accurate drawing of the object will be traced upon the paper. 
I obtained a very satisfactory result even with the first trial, the object drawn 
being the leg of a bee. 
Fig. 2 is a general view of the drawing arrangements when they are in use. 
The proportions of an instrument made to draw the apparent size of magnified 
objects are as follows : — Length of the minor sides of the parallelogram within 
the eye-piece, half an inch ; length of the major sides, 5f inches. The micro- 
pantograph when extended the full length measures 12\ inches. 
VOL. VIII. 
B 
