these would have been over-exposed, and some of the de- tory through the generosity of Mr. William H. sired results thereby lost. ‘hese fields of work are extremely valuable results is precisely the conclu- Crocker, to observe the total solar eclipse of May sion drawn from the polarigraphic… … adopted by nearly all eclipse parties. ‘The lens is tion to the fact that if these annual displays are a Ss at the top of the tower, and the plate holder, moving correct indication of the year-by-year advance made by clockwork, is at the bottom. The lens is supported in the industry, the past…
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