1863. | Progress of the Trigonometrical Survey, 123 
sets of photographic apparatus were sent out to this country by the 
Secretary of State for India, for similar employment, and it is with 
one of these that I am endeavouring to have our maps copied. The 
operation is by no means easy, for the apparatus has had to be speci- 
ally adapted to make full scale copies, and not reductions merely, for 
which it was originally intended, and the maps require to be drawn 
with special reference to future copying or reducing by photography. 
An ordinary finished map cannot be reduced without a large portion 
of the names becoming too microscopic to be easily legible. In the 
first Kashmir map the rivers were coloured in blue, and the broken 
land and low hills in red, the higher ranges being in Indian ink. 
Consequently a photograph of it would shew neo rivers, and would 
invert the depth of shading of the high and low hills, bringing the 
latter into excessive prominence.* 
24. Captain Melville, who has already been mentioned in con- 
nexion with the Topographical Survey of Kashmir, has attained 
considerable skill as a photographer, and succeeded in making an 
excellent reduction to half scale of the second Kashmir map, before 
any names were printed on it. The reduction will have the names 
inserted by hand, and will then be ready for being copied to full 
scale, and afterwards printed, for as extensive circulation as the limit- 
ed means at my disposal will permit. Ihave every reason to hope 
that, with Captain Melville’s assistance, I may be able to supply a 
want which has often been seriously felt. 
25. In concluding this report of the operations of the Trigono- 
metrical Survey, I am happy to be able to express my opinion that 
the progress made on all sides, both in the field, and during the re- 
cess, by the Survey parties, and by the offices at Head Quarters, 
has been most satisfactory. 
* A Map of Asia between the parallels of 20° and 60° on the scale of 100 
geographical miles to the inch, has been recently compiled under my superin- 
tendence, partly in this office, and partly in the Surveyor General’s of which I 
had temporary charge from 10th January to 24th March last. It gives the most 
recent information available from our own and other sources of the countries 
. between St. Petersburg and Pekin, Tobolsk and Calcutta. The boundaries of 
the territories respectively under British and Russian protection are shown, and 
the caravan routes from India to all parts of Asia. ‘he map is now available in 
the office of the Surveyor General, Calcutta. 
