Rain, and Height of Barometer in May. 155 



seen some of Sir W. Congreve's at only 25° elevation make 

 their first graze at two miles;) but the extent of range is not 

 the principal point. 



It is to be regretted that Capt. Parlby thought it expedient 

 to differ from Sir W. Congreve's mode of designating the va- 

 rious sizes of rockets. It would be immaterial, but the system 

 of the latter having been established these 20 years, the inno- 

 vation is attended with inconvenience : for instance, what on 

 Sir W. Congreve's simple plan would be called a 5-pounder, 

 is designated a 1 ^-pounder by Capt. Parlby. This may ac- 

 cord with the "Liber Ignium" of Marcus Graecus; but can- 

 not now be adopted without confusion. 



Your obedient servant, 

 June 1824. — Asiatic Journal. Ban. 



To the Editors of the Philosophical Magazine and Journal. 

 Gentlemen, 



On looking over the Meteorological Table at the end of 

 your last number [May], I was struck on observing the great 

 difference in the quantity of rain, which fell on or about the 

 15th of May at Boston, compared with that of the same pe- 

 riod at London and Gosport. Also, the altitude of the ba- 

 rometer, on the 14th, at Boston was greater than at Gosport, 

 contrary to the averages of the 30 days there registered, which 

 is *24 of an inch less at the former place than at the latter. 

 The quantity of rain at Boston at the time here mentioned 

 was only fths of an inch, whereas at Gosport it was 3*64- 

 inches, and at London 2-1 inches. If that be the case, this 

 great and almost unprecedented fall of rain was not altogether 

 so general as might at first be supposed, from the very great 

 and rapid floods it produced in many parts of the country. 

 These, together with other considerations relative to the at- 

 mospheric phenomena of that month, have induced me to 

 trouble you with a portion of my meteorological journal of 

 the month of May, leaving it to your judgement either to in- 

 sert it, or reject it as may be thought proper. 



Should others of your meteorological correspondents be 

 inclined to communicate their journals for the same period, 

 or if only for the first moiety of the month, they will find, on 

 comparing these registers, something more than usually inter- 

 esting, especially as to the atmospheric pressure and the fall 

 of rain. I wish Mr. Veall would give some account of his 

 barometer and rain-gauge, and likewise the locality of their 

 situation. Yours truly, Thomas Squire. 



Kpping, June 7th, 1824. 



U2 1824.. 



