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The Metroscope

Comprises a series of squares accurately engraved upon the finest plate
glass by machinery. The two plates of glass (of which one form of the
instrument consists), are ruled for convenience with squares differing
in size. These are framed and held together by thumb screws, allowing
sufficient space between them for inserting and securing a picture the
size of a cabinet photograph. The lines are thus brought into such
perfect contact with all parts of the photograph so that they appear to
be drawn on it. One feature of this instrument which renders the square
system very practical, consists of the division and sub-division of the
squares by dotted lines and dash lines. The eye naturally divides a
line or space into halves and quarters, and for this reason the dash
lines have been designated for quartering the main lines, and the
dotted lines for quartering the squares thus formed. This gives sixteen
times as many squares for use as are drawn upon the photograph.

A method based on the same principle as the metroscope, but not
requiring the use of that instrument, may be pursued, as follows:
Fasten the photograph to a board, mark the space at the top, bottom and
sides into one-quarter inch divisions, and drive sharp pointed pins in
each of the division marks. Taking a spool of white thread run it
across vertically and horizontally from each pin to the one opposite,
and you will then have the photograph divided into one-quarter inch
squares; then, if your enlargement is to be six times the size of the
photograph, take the mounted crayon paper and divide the sides and top
and bottom in 1-1/2 inch squares, run thread across the same as for the
photograph, and then proceed to draw the outline, first in charcoal,
and afterwards with the crayon. The spaces marked on the crayon paper
should in each case, of course, be as many times greater than those
marked on the photograph as the intended enlargement is greater than
the photograph.

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