] 10 CHRONOMETERS. 



for which we then received the premium of Three Hundred Pounds. The extreme 

 variation of these five chronometers was as follows : 



In 1828, No. 1410 in twelvemonths 1.41 actual extreme variation. 

 679 ditto 0.98 



1600 ditto 1.31 



^^^^^ 460 ditto 1.24 



1502 ditto 1.52 



In 1830, one of our chronometers was entitled to the second prize, and some others of 

 our making were within the limits. 



In the trial of 1831, the chronometers made by us obtained the whole of the three 

 prizes, and another was fifth on the trial list. We may be excused for making particular 

 reference to the trials of this year, from the remarkable circumstance, that in all the 

 preceding years, from 1822, when the trials for prizes were first established, a period in 

 which several hundreds of chronometers had been sent for trial, but four had performed 

 within one second of extreme variation in the twelve months ; whilst in this trial the 

 WHOLE of our four chronometers went within less than a second of extreme variation; 

 the following being the extreme variations as published by the Astronomer Royal : 



No. 311 in twelve months 0.70 actual extreme variation. 

 2 ditto 0.86 



665 ditto 0.89 



1 ditto 0.99 



In 1832 and 1833, chronometers made by us were entitled to prizes; and several 

 others of our manufacture have been frequently within the limits prescribed by the Go- 

 vernment, forming a large proportion of the best chronometers submitted to public trial. 



It has been repeatedly suggested to us, that a principle so important as ours has 

 proved to be, should be imparted to the public, as every thing tending to the improve- 

 ment of chronometers is a matter of national concernment. We are willing to give 

 up to the pubhc the benefit of our knowledge and experience in these matters, on 

 receiving, as others have done, an adequate compensation for the value which the 

 discovery is of to us in our private business; but we hold ourselves justified in with- 

 holding an explanation of the principle, until it either ceases to be of importance 

 to us, or we are adequately remunerated for disclosing it. 



Government having directed that the public trials of chronometers at Greenwich, for 



