52 Beppicker— On the Influence of Magnetism on the Rate of a Chronometer. 
CHRONOLOGICAL LIST OF PAPERS QUOTED. 
1.—S. VARLEY: 
“On the Irregularity in the Rate of Going of Time-pieces, occasioned by the Influence of 
Magnetism.” [Dated, May 81, 1798.]— The Philosophical Magazine, by Alexander 
Tilloch, vol. i., pp. 16-21. London, 1798. 
2.—Lizutenant Muncs, R.N.: 
“On the Difference between the Land and Sea Rates of Chronometers, deduced from the 
Register kept on board H. M. Ship ‘Leven,’ in two Voyages to the Cape de Verd 
Islands.”’—The Edinburgh Philosophical Journal, conducted by Dr. Brewster and Pro- 
fessor Jameson, vol. v., pp. 878-380. Edinburgh, 1821. 
3.—Limutenant Munez, R.N.: 
‘*On the Magnetic Influence of the Islands of 8. Mayo and the Great Salvage.’’—Jbid., pp. 
381-383. : 
4,—GrorGE CoLEMAN : 
Tables (Appendix to the following Paper of George Fisher). [Dated, June 5, 1820] .— 
Philosophical Transactions of the Royal Society of London for 1820, p. 208, ff. 
5.—Gerorce FisHer : 
“On the Errors in Longitude as determined by Chronometers at Sea, arising from the 
Action of the Iron in the Ships upon the Chronometers.’’ [Dated, June 8, 1820.]— 
Ibid., pp. 196-207. — 
6.—Prrer Bartow : 
‘“On the Effects produced in the Rates of Chronometers by the Proximity of Masses of Iron.”’ 
[Dated, June 28, 1821.]— Philosophical Transactions for 1821, pp. 361-389. London, 
1821. 
This Paper has been frequently reprinted: for instance, in The Edinburgh Philosophical 
Journal, vol. v., 1821 (pp. 883-885). A further mention of it is made in the 
Astronomische Nachrichten, No. 2, p. 81, 1821, in a letter of Barlow to the editor. 
About this we find the following remark of F. W. Bessel in Recensionen von F. W. 
Bessel, Rudolf Engelmann, Leipzig, 1878, p. 256: — ‘‘ Barlow zeigt an, dass das 
Hisen auf den Schiffen auch den Gang der Chronometer andere; eine erhebliche 
Bemerkung, wenn sie sich bestitigt! Bei der jetzigen Vortrefflichkeit der Chrono- 
meter von Breguet, Jtirgensen und Kessels kénnte man leicht auf dem Lande 
entscheidende Versuche dartber anstellen.”’ 
