. Philosophical transactions of the Royal Society of London . ,_/W Mlin-c/teX/,.. of the prismatic Colours to heat and illuminate Objects. 283 communicated, the glasses have met with no accident. How-ever, when the sun is at a considerable altitude, it will beadvisable to lessen the aperture a little, in telescopes that haveso much light as my 10-feet reflector; or, which will give usmore distinctness, to view the sun earlier in the morning, andlater in the afternoon; for, the light intercepted by the atmo-sphere in lower altitudes, will reduce its brilliancy much moreuniformly than we ca
. Philosophical transactions of the Royal Society of London . ,_/W Mlin-c/teX/,.. of the prismatic Colours to heat and illuminate Objects. 283 communicated, the glasses have met with no accident. How-ever, when the sun is at a considerable altitude, it will beadvisable to lessen the aperture a little, in telescopes that haveso much light as my 10-feet reflector; or, which will give usmore distinctness, to view the sun earlier in the morning, andlater in the afternoon; for, the light intercepted by the atmo-sphere in lower altitudes, will reduce its brilliancy much moreuniformly than we can soften it, by laying on more smoke uponour darkening glasses. Now, as few instruments in commonuse are so large as that to which this method of darkening hasbeen adapted, we may hope that it will be of general utility insolar observations. Slough, near Windsor,March 8, 1800. C2843 XIV. Experiments on the Refrangibility of the invisible Rays of theSun. By William Herschel, LL. D. F. R. S. Read April 24, 1800. In that section of my former paper which treats of radiant heat,it was h
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Keywords: ., bookauthorro, bookcentury1600, bookdecade1660, booksubjectscience
