IS8 



APPENDIX. 

 " is made to vibrate till 60 on the fecond-clrcle comes to 

 ** the index, and is then to be held at the extremity of 

 " its vibration by a trigger; on prefllng which with the 

 " finger, the pendulum is difengaged in an inftant : hence 

 *' the vibrations mull be of equal extent in every experi- 

 " ment. 



" The wooden ftand which fupports the pendulum is 

 " fo conitruded, that it forms an oblong fquare box, in 

 " which the pendulum, with every part of its apparatus, 

 *' is with great facility and expedition packed ; fo fecurely 

 " that no part can receive damage ; and the whole is fo 

 " portable, that it may with eafe be carried on a man's 

 " fhoulder to any acceflible place. 



" This pendulum immediately before the voyage was 

 " compared with a well-regulated eight-day clock, and in 

 " twelve hours its beat did not differ fenfibly from that of 

 ** the clock 3 Fahrenheit's thermometer being then at 60°." 



July the fixteenth the Pendulum and the Equatorial In- 

 flrument were landed on a fmall rocky ifland in latitude 

 79° 50' N; and the pendulum being carefully fet up in 

 a fmali tent ereded for that purpofe, and its pofition truly 

 adj ailed, a thermometer was fufpended on the hook 

 behind the pendulum-rod 3 and the pendulum being re« 

 2 peatedly 



