136 



Sarometric Olservatiohs. 



afforded by the barometer, have been in the days of this montti, 

 from the 5th to the 8th included ; because the barometer baa 

 bees ;flni()st steady betuceii 30.7S to 30 48. But until we can 

 obtain the mean of the heights of the barometer for at least a 

 whole year, we shall hare very little chance to ascertain by tht« 

 instrument, the height of these places above the level of the sea. 

 To Mr. Tilloch. A Constant Reader. 



Epping, Feb. 15, 1821. 

 Sir, — The following barometrical observations made at this 

 place, were take4i with the greatest care, and exactly at the times, 

 proposed. 



It is much to be hoped, that gentlemen who have good instru- 

 ments for ascertaining the correct atmospheric pressure, will take 

 the trouble of making very careful observations on the secon«i 

 Monday in every month, at the hours of 8, 9, 10, 11 and 12 hi 

 the morning, as previously fixed on bv Mr. Bevan. 



I am confident such observations will have their use, not only 

 in ascertaining the altitude of different stations above zero, or 

 the surface of the sea at low water, but may probably be the 

 means of leading to some discoveries relative to the pressure of 

 the atmosphere, that are not at present known. 



From corresponding barometrical observations made here, and 

 at London Bridge, together with those published in your valuable 

 Journal, I am led to believe that the altitude of Epping, above 

 the surface of the sea, is not quite 400 feet ; yet the hill called 

 Highlecch, situated about five miles S.W. of Epping, and which 

 is not higher than this place, is stated (from observations made 

 in the course of the Trigonometrical Survey) at 790 feet above 

 the level of the sea ! 



Yours truly, 



'T Tf- n^llJnrh^ ThOMAS SoUIRE. 



Epping, 



