Miscellaneous Intelligence. 453 
6. Telegraphic Longitude at Brussels—Under this title, the Athe- 
neum of January 14th, states that the American method of determin- 
ing difference of longitude by means of the Electric Telegraph, has 
at last been introduced into Europe. “The Roya Observatory at 
Greenwich is now permanent spe tem by one line of wires with the 
South Eastern and Electric Telegraph System, and by another line 
with the System of the Submarine and Electric Telegraph.” At the 
observatories of Brussels and —- _ 3000 signals have been 
observed simultaneously for the compar of the two transit clocks, 
The lines are available also for experimenting on the time occupied by 
the passage of the galvanic pulse from Greenwich to Brussels and the 
reverse. And from “the observations thus far made, it appears that the 
time is “ pretty accurately one-tenth of a second.” ‘Rapid as is the 
velocity which this implies (about 2700 miles per second, supposing the 
velocity uniform along the whole line) it is much less rapid than that 
found in the experiments with Edinburgh (about 7600 miles per second), 
and still less than that determined on some of the American lines 
(about 18000 miles per second). The difference undoubtedly depends 
on the circumstance that the greater part of the line to Brussels is subter- 
ranean and submarine, which position of the wires, one in any de- 
gree impairing the insulation (which, perhaps, is the most perfect in 
the world), does by an ill-understood effect of induction, oes retard 
the speed of transit.” 
It is expected ‘Abt before long Greenwich will be connected in a 
similar way with the French and Dutch observatories, and these with 
others over Europe. 
‘Nearly the whole of Europe is now covered with a net of geodetic 
triangulation, nopeopatn the western coasts of Ireland and France 
with the interior of Russia and borders of Turkey. The combination 
of the geodetic “pra ey the ascertained difference of longitude 
will afford one of the best materials for the measure of the ear! 
7. The World 3 Science, Art and Industry, illustrated from Exam- 
ples in the New York cael “ee *B4. Edited by Prof. B. Sinit- 
MAN, Jr., and C. R. Goopricn, Esq., aided by several scientific and 
literary men. With 500 osetia, silo the superintendence of C, 
E. Dépler, Esq. 200 pp. 4to., New York, 1854, G. P. Pulnam.—This 
work, independently of the great number ‘and elegance of its ~ nea 
tions, has a high value asa record of the Exhibition at New 
1853, « and also on account of the man essays it contains on aceon 
a with the recent progress of practical science and the va- 
rious a 
8. The bhets Maganic Telegraph ; by Laurence Turnsutt, M.D., 
2nd edition, revised and improved, illustrated by numerous engravings. 
264 pp. 8vo. Philadelphia, 1853. A. Hart.--This work on the Tele- 
graph j ~ practical, scientific and historical, and the best exposition we 
have of the American system. Moreover, in an =< mated it contains 
several important telegraphic decisions and laws. The w 
improved by an — of the application of the Delegnaith to the de- 
termination of longitu 
Szcoyp Series, Vol. nn No. 51.—May, 1854. 58 
