I could not for a long time feel justified in spending so much money for my own personal enjoyment. My children were then young and dependent upon me. They required to attend school--for education is a thing that parents must not neglect, with a view to the future. However, about the year 1875, my attention was called to a cheap instrument advertised by Solomon--what he called his '5L. telescope.' I purchased one, and it tantalised me; for the power of the instrument was such as to teach me nothing of the surface of the planets. After using it for about two years, I sold it to a student, and then found that I had accumulated enough savings to enable me to buy my present instrument. Will you come into the next room and look at it?"I went accordingly into the adjoining room, and looked at the new telescope. It was taken from its case, put upon its tripod, and looked in beautiful condition. It is a refractor, made by Cooke and Sons of York. The object glass is three inches; the focal length forty-three inches; and the telescope, when drawn out, with the pancratic eyepiece attached, is about four feet. It was made after Mr. Robertson's directions, and is a sort of combination of instruments.
"Even that instrument," he proceeded, "good as it is for the money, tantalises me yet. A look through a fixed equatorial, such as every large observatory is furnished with is a glorious view. I shall never forget the sight that I got when at Dunecht Observatory, to which I was invited through the kindness of Dr.
Copeland, the Earl of Crawford and Balcarres' principal astronomer.
"You ask me what I have done in astronomical research? I am sorry to say I have been able to do little except to gratify my own curiosity; and even then, as I say, I have been much tantalised. I have watched the spots on the sun from day to day through obscured glasses, since the year 1878, and made many drawings of them. Mr. Rand Capron, the astronomer, of Guildown, Guildford, desired to see these drawings, and after expressing his satisfaction with them, he sent them to Mr. Christie, Astronomer Royal, Greenwich. Although photographs of the solar surface were preferred, Mr. Capron thought that my sketches might supply gaps in the partially cloudy days, as well as details which might not appear on the photographic plates. I received a very kind letter from Mr. Christie, in which he said that it would be very difficult to make the results obtained from drawings, however accurate, at all comparable with those derived from photographs; especially as regards the accurate size of the spots as compared with the diameter of the sun. And no doubt he is right.
"What, do I suppose, is the cause of these spots in the sun?
Well, that is a very difficult question to answer. Changes are constantly going on at the sun's surface, or, I may rather say, in the sun's interior, and making themselves apparent at the surface. Sometimes they go on with enormous activity; at other times they are more quiet. They recur alternately in periods of seven or eight weeks, while these again are also subject to a period of about eleven years--that is, the short recurring outbursts go on for some years, when they attain a maximum, from which they go on decreasing. I may say that we are now (August 1883) at, or very near, a maximum epoch. There is no doubt that this period has an intimate connection with our auroral displays;but I don't think that the influence sun-spots have on light or heat is perceptible. Whatever influence they possess would be felt alike on the whole terrestrial globe. We have wet, dry, cold, and warm years, but they are never general. The kind of season which prevails in one country is often quite reversed in another perhaps in the adjacent one. Not so with our auroral displays. They are universal on both sides of the globe; and from pole to pole the magnetic needle trembles during their continuance. Some authorities are of opinion that these eleven-year cycles are subject to a larger cycle, but sun-spot observations have not existed long enough to determine this point. For myself, I have a great difficulty in forming an opinion. I have very little doubt that the spots are depressions on the surface of the sun. This is more apparent when the spot is on the limb. I have often seen the edge very rugged and uneven when groups of large spots were about to come round on the east side. I have communicated some of my observations to 'The Observatory,' the monthly review of astronomy, edited by Mr.
Christie, now Astronomer Royal,as well as to The Scotsmam, and some of our local papers.and others, were of the best. He commenced turret-clock making in 1852, and made many improvements in them. We had by that time removed to Coney Street; and in 1855 the Buckingham Works were established, where a large number of first-rate workmen were employed. A place was also taken in Southampton Street, London, in 1868, for the sale of the instruments manufactured at York."Thus far Mrs. Cooke. It may be added that Thomas Cooke revived the art of making refracting telescopes in England. Since the discovery by Dollond, in 1758, of the relation between the refractive and dispersive powers of different kinds of glass, and the invention by that distinguished optician of the achromatic telescope, the manufacture of that instrument had been confined to England, where the best flint glass was made. But through the short-sighted policy of the Government, an exorbitant duty was placed upon the manufacture of flint glass, and the English trade was almost entirely stamped out. We had accordingly to look to foreign countries for the further improvement of the achromatic telescope, which Dollond had so much advanced.
