VI. Experiments on the production and propagation of light from the phosphorus in vacuo , made before the Royal Society by Mr. Fra. Hauksbee

Experiment I. In pursuance to the Commands of his Honourable Society, Having a dark Room provided, the first Experiment was by drawing some Lines on a piece of blue Paper with the Phosphorus , which became immediately Luminous in the open Air, having a continual undulating Motion. This being plac'd under a Receiver, after some few Exclusions, the Undulation ceas'd, but the Luminous Quality appeared to be in a great measure increas'd; the Receiver being farther exaulted, it became manifestly brighter; and so continu'd, till on the Admission of Air (which was gradually done) the Light sensibly diminishing all the while. But upon the Repetition of the Experiment, it was the Opinion of those Gentlemen then present, that it did not appear altogether so brisk or so vivid as at first.