I presume that a
well-known traveller would never find a difficulty in obtaining the
calculations he might desire, through the medium of that Society, if it
was distinctly understood that they were to be made at his own cost.
Lithograph Maps.--It may add greatly to the interest which a traveller
will take in drawing up a large and graphic route-map of his journey, if
he knows the extreme ease and cheapness with which copies of such a map
may be multiplied to any extent by a well-known process in lithography:
for these being distributed among persons interested in the country where
he has travelled, will prevent his painstaking from being lost to the
world. Sketches and bird'[S-eye views may be multiplied in the same
manner. The method to which I refer is the so-called Anastatic process;
the materials can be obtained, with full instructions, at any
lithographer's shop, and consist of autographic ink and paper. The paper
has been prepared by being glazed over with a composition, and the ink is
in appearance something like Indian ink, and used in much the same way.
With an ordinary pen, with this ink, and upon this paper, the traveller
draws his map; they are neither more nor less difficult to employ than
common stationery, and he may avail himself of tracing-paper without
danger. He has one single precaution to guard against, which is, not to
touch the paper overmuch with his bare and, but to keep a bit of loose
paper between it and the map as he draws.
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