330 Chronometers. 
eral alluvial deposits of gold to the eastward of it; they are known 
under the name of deposit or surface mines; they are worked with 
profit, The gold has probably been brought to them, by the agency 
of water, from veins to the westward of and above the iron belt. It 
would be a striking feature in the geology of the state, should de- 
posits of the two most extensively distributed metals in nature, be 
found in juxtaposition to each other, for many miles, each marking 
the limits of the other, without ever encroaching upon its borders, 
Arr. X V.—Chronometers. 
Havine in Vol. xxrx, at p. 279 of this Journal given publicity to 
the experience of those eminent chronometer makers, Messrs. Par- 
kinson & Frodsham, of London, we now readily extend the same 
courtesy to Messrs. Arnold & Dent,* of that city ; aware also that, 
after Great Britain, no country has so deep an interest in chronome- 
ters as this, for every sea is whitened by our canvass. 
The following passage from Obed Macy’s History of Nantucket 
the case of many thousands of our countrymen. 
“ The wide ocean is the source of their livelihood, and they breast 
its waves and grapple with its monsters, in every latitude between 
the polar ices. The sun never sets on their industry; they labor 
and worship under the whole dome of the firmament. The objects 
of their affections are abroad on the deep, or buried forever beneath 
its billows; their prayers are wafted on every wind and their tears 
are mingled with every surge. 
To these adventurous labors of the intrepid whalemen, the cbro- 
nometer is indispensable, for the longitude, and it is said that New 
Bedford, the neighbor and friendly rival of Nantucket, has the me 
keepers at this moment to the amount of $87,000 
On the Application of Glass, as a substitute for Metal ate 
Springs 1 in Chronometers. 
[From the Nautical Magazine, for December, 1836.] 
Sir,—On several occasions we have occupied a space in your valu- 
able Be pornel with some account of experiments which we have made, 
BeNote fea Messrs. Arnold & Dent, dated Landon Dec. 8, 1826. oii Mant Ae 
nold & Dent. beg to present Prof. Silliman with an account of their experiments 
on metal eee balance springs of chronometers, and also the official rates of 
two ch pretee caachanre iis tried by order of 
the L ords Commi f the Admiralty. 
