. Philosophical transactions of the Royal Society of London . might befelt. No. 27. I used two black glasses, placed as in No. 25. Herethere was no occasion for smoke; but the sun appeared of abright scarlet colour, and an intolerable sensation of heat tookplace immediately. I rather suspect that these are very deep redglasses, though their outward appearance is black. In order to have a more sure criterion of heat, I applied thermometer, No. 2, to the end of the eye-piece,where the eye is generally placed. With No. 25, it rose from34 to 37 degrees. With No. 26, it rose from 35 to 4
. Philosophical transactions of the Royal Society of London . might befelt. No. 27. I used two black glasses, placed as in No. 25. Herethere was no occasion for smoke; but the sun appeared of abright scarlet colour, and an intolerable sensation of heat tookplace immediately. I rather suspect that these are very deep redglasses, though their outward appearance is black. In order to have a more sure criterion of heat, I applied thermometer, No. 2, to the end of the eye-piece,where the eye is generally placed. With No. 25, it rose from34 to 37 degrees. With No. 26, it rose from 35 to 46; and,with No. 27, it rose, very quickly, from 36 to 0,5 degrees. I ampretty sure it would have mounted up still higher; but, the scaleextending only to 100, I was not willing to run the risk ofbreaking the thermometer by a longer exposure. It remains now only to be added, that with No. 25 and 26 Ihave seen uncommonly well; and that, in a long series of veryinteresting observations upon the sun, which will soon be //„/„., Van*. MDCC< //,//. X// ***. ,_/W Mlin-c/teX/,.
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