234 Gould's Report on Trans-Atlantic Longitude. 
) 
far from 700 myriameters (4,320 statute miles) in length, formed 
of the two cables joined at the ends, using a battery composed 
of a percussion gun-cap, a morsel of zinc, and a drop of acidu- 
lated water.” : 
It is obvious that, with this instrument, there must be an 
appreciable loss of time in noting si due to inertia of 
The other instruments used were the regular apparatus of the 
telegraphic party of the Coast Survey ; at each station, a 46-inch 
a line upon a revolving cylinder, records the signals, both 
the clock and of the observer, by offsets from this normal line. 
At Valencia, observations were obtained on fifteen nights, 
on no one of which was the sky unclouded. “On only two of 
the five nights on which longitude signals were exchangt 
with New oundland, was it possible too tain observations : 
