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. 



Art. XV. — Chronometers. 



Having in Vol. xxix, 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 

 describes 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 chro- 

 nometer is indispensable, for the longitude, and it is said that New 

 Bedford, the neighbor and friendly rival of Nantucket, has the time 

 keepers at this moment to the amount of $87,000. 



On the application of Glass, as a substitute for Metal Balance 

 Springs in Chronometers. 

 [From the Nautical Magazine, for December, 1836.] 

 iSir, — On several occasions we have occupied a space in your valu- 

 able journal with some account of experiments which we have made, 



* Note from Messrs. Arnold & Dent, dated London Dec. 8, 1826. — Messrs. Ar- 

 nold & Dent beg to present Prof. Silliman with an account of their experiments 

 on metal and glass balance springs of chronometers, and also the official rates of 

 two chronometers having glass balance springs and balances, tried by order of 

 the Lords Commissioners of the Admiralty. 



