al Aca- good line. The wire should be supported at inter- demy of Sciences, in 1861, he presented a paper vals of 300 or 800 feet on glass or porcelain insula- " On Photographs of the Solar Spectrum,'' accom- tors. panied by a picture that he had taken by means The precautions necessary to observe… … cacy or exactness. One taken on Feb. 27,1871, means of support, and secondly because the cost of is stated by Warren de' la Rue to be the finest in scientific apparatus is usually so great that it existence. prevents private ownership. Very few, for in- He constructed a micrometer for the measure-…
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