The scientific papers of Sir William Huggins (1909)
Huggins, William, Sir, 1824-1910, Huggins, Lady, d. 1915 · London, W. Wesley and son · leaf 35
lit is of this width of opening the solar lines are still welldefined, but the number of lines to be counted between H and K is reducedto about seven. I found it was not possible to work with a narrower slit. The base plate of the apparatus is bevelled at the edges, and slides in thegrooves of a… … Fig. 7- apparatus fixed at the end of the tube, as already described, was so adjustedthat the slit was brought exactly to the position of the principal focus of thelarge speculum. The grooves in which the apparatus slides are graduated, sothat the apparatus after removal can be replaced exactly in…
Astronomy
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