290 Captain Wauchope on regulating Chronometers. 



rate rate for the time-pieces on board i«ay not be found. Chro- 

 nometers will be more generally adopted, and the risk attached 

 to both life and properii/ embarked in ships, be much dimi- 

 nished. 



I shall feel much obliged by your giving this a place in the 

 next Number of the Edinburgh Philosophical Journal. — I re- 

 main, &c. 



R. WAUCHOPiEk 



Easteb Ddddingstone, 

 1st Febmary 1830. 



Description of tJie Signal-Post for regulating Chronometers. 



DE, Plate V., is intended to represent the interior of an ob- 

 servatory, through the roof of which, the halliards d (or hoisting 

 line of the ball C) pass, and are then secured at x, by the disen- 

 gaging lever y. z is intended to represent a time-piece, or the 

 observatory-clock, by which the signal is regulated. The 

 drawing represents a time-piece z, placed upon the same table 

 Avith the disengaging lever y, so as to allow the observer to have 

 his eye upon the time-piece, and his hand upon the disengaging- 

 lever, that the signal may he instantaneous. 



A C represent two balls, of four or five feet diameter, made 

 in the usual way of black canvas and iron wire. A B represents 

 an iron rod, which secures the upper ball A, to the upper out- 

 rigger, and passes through the diameter of the ball C, and is 

 secured upon the lower outrigger at B. Upon this rod the ball 

 C traverses. A segment of the ball A is cut off at the point of 

 contact of the two balls, as in the drawing, that no daylight 

 may be seen between them, when in the position there repre^ 

 sented. 



d represents the halliards (or hoisting-line) of the ball C, 

 which is rove through a small block on the upper outrigger, 

 and passes through the centre of the ball C, and through the 

 roof of the observatory, and is there secured by the disen- 

 gaging lever y at x., upon the table, where the regulating 

 time-keejper s, is placed. 



e represents the downhaul of the ball C, at the end of which 

 and about four feet fron^ the ground, a weight is attached. 



