Gould's Report on Trans-Atlantie Longitude, 243 
two from occultations of Pleiades, without regard to weight, is 
5® 8™ 125-99, 
We regret that we have not room for even a brief abstract of 
the valuable closing chapter on the transmission-time of signals, 
but are compelled to dismiss it with barely stating the gene- 
ral result and some conclusions with respect to a few points, as 
derived from the experiments. 
€ transmission-time by cable, after correction for personal 
~~ in noting signals (0*303), was found to be for the several 
1866, October 25, 0°:314 Cable of 1865, with earth and condenser. 
. 4 oe “ “co oe iT4 oe 
? 
November 5, -280 Both cables, no earth. 
6 2 48 “ “ “ “ 
9, 02 40 “ “ce “ 29 
The battery-strength on these nights was as follows :— 
October 25, 10 cells at Valencia, 10 cells at Newfoundland. 
1 oO oe 66 “ 10 cee oc 
“ce 
28 
November 5. 3 « & “ 3 (73 “ 
e.g. = “ 10 “« «& “ 
9. 4 %& «& “ 10 « “ rT 
es 
From these results the inferences seem warrantable, 1st, that 
the velocity of transmission is greater when the circuit is di 
and consists of a good metallic conductor exclusively, than 
when the signals are given by induction, although the earth may 
be at the other electrode; and 2d, that an increase of intensity 
io the electromotive force is ra a by an increase in the ve- 
ocity of propagation of the sign: . 
fe te sare for longitude, and from other experi- 
ments made with special reference to particular points, the fol- 
but simply an electrical disturbance, is requis t- 
ung a signal; that an inductive impulse, sufficient to deflect the 
galvanometers employed, was transmitted through one cable, 
. 
