Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 367
all always bisect the angle subtended at themirror by the object and the telescope or other apparatuson which the ol)ject is reflected. It was Foucault who, towards the end of his life, 344 STARGAZING : PAST AND PRESENT. [book v. thougiit of the immense use of an instrument of thiskind as a… … Fio. 156. —Foucaults Siderostat. Mr. Eichens to construct a siderostat, and this one waspresented to the Academy of Science on December 13th,1869, and is now at the Paris Observatory. Since thatdate others have been produced, and they have everychance of coming largely into use, especially in…
Astronomy · Telescopes
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