Abstract
ON the afternoon of the 18th ult., in company with Herr Lohse, of this observatory, I was occupied in adjusting a spectroscope attached to the 15-inch refractor. The sun was disappearing behind the ridge of the hill of Fare, about five miles distant. To utilise the last rays of the sun, I was directing the telescope on the gradually lessening segment of the sun's disk, while Herr Lohse was looking through the spectroscope. Under these circumstances it will be understood that we were both standing near the inner vertical surface of the drum-shaped dome, close to where it was lit up by the sunlight coming through the opposite vertical opening, which is 40 inches wide. It may be well to add that the dome is made of corrugated iron, painted slate-colour, the corrugations of the wall being vertical.
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