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Clark, Alvan Graham

astronomer, inventor, was born July 10, 1832, in Fall River, Mass. During 1886 the 36-inch refractor, the largest in the world, was made for the Lick observatory on Mount Hamilton, near San Francisco, Cal. Mr.

Clark accompanied the total-eclipse expedition to Jerez, Spain, in 1870, and also the similar expedition to Wyoming in 1878. As an independent observer he has discovered fourteen intricate double stars, including the companion to Sirius, for which the Lalande gold medal was awarded him by the French academy of sciences in 1862. He has also made numerous inventions connected with the manufacture of refracting telescopes.