Comments on the effect of great temperature variations on the speculum of a telescope.
Showing 1–5 of 5 items
Comments on the effect of great temperature variations on the speculum of a telescope.
ES has been forwarded letter explaining why 'great telescope' at Melbourne will not work and suggesting construction corrections, on which JH, who believes such 'a priori condemnation' unjustified, comments herein.
Approves of ES's actinometric methods, but wonders about absorbent power of alcoholic liquid. Laments 'sad conclusion' to career of 'Hansa,' and hopes her companion is more successful.
Discusses significance of Col. Napier's pendulum observations to research on earth's constitution and gravitation.
Thanks for telegram and has dispatched papers about absorption power of actinometer liquid. Hopes letter written in Lady Sabine's handwriting does not indicate serious illness of ES.