| Description | He leaves his rooms the next day but will stay in Manchester longer, to get further in his spectroscopic work. Dr. Basil will put him up for the week, after which he will be at home. Joseph could stay at the Ducie Hotel if he comes to Manchester. Someone told him about a complete set of Crille in a recent catalogue. He describes his spectroscope work, including the differences between spectra between iron and platinum poles, which has an important bearing on sunspots and solar prominences. He notes the high temperature lines in prominences, and low lines in sunspots. He has identified a number of interesting examples, but Arthur] Schuster wishes him to examine the behaviour of lines under varying conditions, including in different solutions of iron salts. He notes the publications they have, including Rowland's photographic map of the solar spectrum. Knight is on a tour of Normandy by bicycle. The weather in Manchester is wintry. |