Skip to main content

18940926 Keeler

WMacDonald's picture

Allegheny Observatory,
Allegheny, Pennsylvania.
Sept 26 1894

My Dear Mr. Lumsden,

      I am greatly obliged to you for your kindness in sending me the bound volume containing the earlier transactions of the society. It makes my set complete, and I can have the later volumes bound to match.

      As for the article I thank you for reminding me of it. I was away during the summer and on returning found a spell of clear weather, something so unusual that I have put all my time into observing. What I had in mind was a method of changing the chromatic aberration of a visual telescope so as to adapt it to photographic work with the spectroscope at H-gamma, but I find it is not such a simple matter as I had supposed. Something of the kind seems to be absolutely necessary if we are to use our great refractors for measuring motions of stars in the line of sight, I will let you know later how I come on.

Yours very sincerely

J. E. Keeler.

The article referred to here appeared in the 1894 volume of the Society's Transactions (starting on page 90).

Keeler letter, 1894 Sept 26 (DJVU - low quality)83.92 KB
Keeler letter, 1894 Sept 26 (DJVU - high quality)904.51 KB