138 NEW ESCAPEMENT. 



New escape- any other accident, the esenpe-wheel should be moved back- 

 roeut. wards, so as to catch on the detents improperly. 



The following observations are necessary to be attended to in 

 this escapement. 



1st. That the renovating and detent springs must spring 

 from one centre, and as similarly as possible. 



2d. That the force applied to the train must be so much 

 more than what will wind up the renovating spring, as will 

 overcome the influence of oil and friction on the pivots of the 

 machine. 



3d. That the renovating spring, when unwound, must rest 

 against the point of the tooth of the wheel ; which will be 

 an advantage, as it thereby takes as much iorce off the tooth 

 of the wheel resting against the detent spring, as is equal to 

 the pressure of the renovating spring C, against the face of the 

 tooth of the wheel. 



4th. The detent springs must be made as slender and light 

 as possible ; though whatever force they take from the pendu- 

 lum, by their elasticity in removing them, to unlock the wheel, 

 so much force they return to the pendulum in following ir ; 

 to where it removed them from j therefore action and re-action 

 will be equal in contrary directions. 



5th. That it is unnecessary for the pendulum to remove 

 the detent or renovating springs, much farther than is neces- 

 sary to free the teeth of the wheel, as it will always vibrate up 

 to the same arc - 3 in table clocks it ought to remove them fur- 

 ther, so that it can go when not placed exactly level, or what 

 is generally termed, out of the beat. 



XL 



Description of a simple, cheap, and easy Method of preventing 

 the Annoyance of steam from Boilers in Manufactories and 

 other Places, By Mr. George Webster, of Leeds*. 



Easy means of PHT1HE introduction of steam into workshops and manu- 



conveytng Jj_ f actor } es [ s injurious to the articles, to the buildings, and 



steam and va- ■ J ' ° 



porupa chim. to the workmen -, and, when the matter evaporated from boilers 

 ney, 



* For which the Soc of Arts gave their silver medal in 1811. 





