and Moon on the Aimofphere. g^j 



annexed, and which have been amply confirmed in extend- 

 ing the inquiry to other regifters. 



The dotted Hne, which, in the barometric chart* (PI. IX.) 

 reprefents the coarfe of ihe barometer, was traced by daily 

 obfervations (with an excellent barometer made by Haas) 

 on a fet of blank charts, each of which ferves for a month j 

 being ruled horizontally with red lines, dividing the fpace 

 rnlo inches and tenths, and ferving for a fcale, and perpen- 

 dicularly with others, two-tenths diftant, one of which is al- 

 lotted to each day f. 



My regilkr was kept at Plaiftow in EiTex, about five miles 

 eaft of London, except three fpaces diftinguilhed by full 

 dots at each extremity, which were noted in London at an 

 elevation not much more than twenty feet greater, and for 

 moft part of which I am indebted to the obfervations of a 

 friend. As the barometer rarely changes its dirt'£lion during 

 the night, it is evident that, by an enlarged fcale and frequent 

 obfervations, a very j^ccurate account of its variations might 

 be kept in this way ; and none can give a more pleafing 

 fynoptical idea of thefe, with the correfponding changes of 

 weather, for the pa ft month or year. 



As the moon's phafes had been inferted in thfe explana- 

 tory plate of Dr. Buxton, by a charafter affixed to the day, 

 I continued this pra6tice, and after fome time began to fuf- 

 peft a coincidence between thefe and the courfe of the baro- 

 meter, which at length became very evident, and gave oc- 

 cafion to further inquiry. This comcidence confifts in the 

 depreffion of the barometrical line on the approach of the 

 new and full moon, and its elevation on that of the quarters. 

 In above thirty out of the. fifty lunar weeks in thi.-; year, the 

 barometer will be found to have changed \i?> general direBion 

 onc» in each week, in fuch manner as to be either rifmg or 



* The accompanying plate is engraved on a fcdle of tialf an inch to an 

 inch. 



t The blnnk charts are fold by Edward Nairne, Cornhill, and were 

 pubhOitd by Dr. Buxton in 1794, who has obliged me with the inlpec- 

 tion of his rcgifter from that time to the prdtnt. There are coliiums added 

 for wind, rain, ice. which it was not neceflary to introduce on this 

 cccalion. 



at 



