PHILOSOPHICAL 
TRANSACTIONS. 
I. An Account of two Rainbows , seen at the same Time , at 
Alverstoke, Hants, July 9, 1792. By the Rev. Mr. Sturges, 
Communicated by William Heberden, M.D. F. R. S. 
Read January 10, 1793. 
On the evening of the 9th of July, 1792, between seven and 
eight o'clock, at Alverstoke, near Gosport, on the sea coast of 
Hampshire, there came up, in the south-east* a cloud with a 
thunder-shower; while the sun shone bright, low in the hori- 
zon to the north-west. 
In this shower two primary rainbows appeared, AB and 
AC, (Tab. I.) not concentric, but touching each other at A, in 
the south part of the horizon ; with a secondary bow to each, 
DE and DF (the last very faint, but discernible), which 
touched likewise, at D. Both the primary were very 
vivid for a considerable time, and at different times nearly 
equally so ; but the bow A B was most permanent, was a 
larger segment of a circle, and at last, after the other had 
vanished, became almost a semicircle ; the sun being near 
^-mdccxciii. B- 
