CHAP. I.] THE EQUIPMENT OF THE SHIP. 59 
(og 
Ma 
mt 
Fre. 13.—The Hydraulic Pump. 
chine, which was made by Messrs. Milne, of Edinburgh, works 
up to a pressure of 4 tons on the square inch. 
On the port side opposite the laboratory two cabins have 
been fitted up, as a light-room and a dark-room, for photo- 
graphic work; and a corporal of Royal Engineers, C. New- 
bold, a very skillful photographer, has been established there. 
The management of a photographic studio during a long sea- 
cruise is a matter of great difficulty. All the cireumstances— 
the motion, the dampness of the air, and its vitiation by va- 
pors of various kinds, and the extremes of climate which af- 
fect the different reagents and materials, all tell against the 
photographer; yet, in spite of these disadvantages, Newbold 
