626 ON THE LUMINOUS ARCH, OR METEOR, 
On the 26th of the same month, he saw another luminous 
arch, which remained visible about half an hour. 
On the 12th of April, between nine and ten o’clock p. m. 
there appeared the grandest specimen of this phenomenon- 
which he had witnessed ; and on the 26th of the same month 
he observed three luminous arches. 
After comparing his observations with each other, and 
with those made in London by Mr. Cavallo; at Oxford, by 
Mr. Swinton; Plymouth, by Dr. Huxham; and Wells in 
Norfolk, by Mr. Sparshal, Mr. Hey was of opinion that these 
arches were of the same nature as the aurora borealis. 
In the same volume of the Philosophical Transactions 
there are accounts by the Rev. F. J. H. Wollaston, of Cam- 
bridge; the Rev. B. Hutchinson, of Kimbolton; J. Frank- 
lin, Esq., of Blockley; and Edward Pigott, Esq., of Ken- 
sington ; of a luminous arch observed by them on the 23rd 
of February, 1784, about nine o’clock p. m.; and also some 
remarks written by the Hon. Henry Cavendish, on the height 
of this arch, which he calculated from the appearances at 
Cambridge and Kimbolton; the latter being about seven 
geographical miles north of the former place. He concludes 
that the arch could hardly be less than fifty-two miles, and 
not likely. to have exceeded seventy-one miles from the 
earth, 
The distance of Moseley, near Birmingham, 
being about sixty miles south of Manchester and 
nearly in the direction of the magnetic meridian, 
