On a new case of the interference of light / by the Rev. Baden Powell.

  • Baden Powell
Date:
1848
Catalogue details

Licence: Public Domain Mark

Credit: On a new case of the interference of light / by the Rev. Baden Powell. Source: Wellcome Collection.

    10/16 page 220
    (27.) Arrangement. Plate. Medium. Number of bands. Glass. Oil of Cummin. B to D. D to E. E to F. Fto G. G to H. Total. I. inch. t='04 Broad. 0 0 5 11 f Faint. I 1 15? / 31 II. No bands. (28.) Oil of Turpentine. I. No bands. II. •08 •04 Fine. rClear in the red H < broader towards > [_ blue. J 14 20 15 10 59 (29.) Water. I. No bands. II. •04 •015 Too fine to count, r Fine and faint; 1 \ difficult to count. / 19 30 ? 22? 15? 86 (30.) Arrangement. Plate. Medium. Number of bands. Calc-spar (by natural cleavage). Oil of Cassia. B to D. D to F. F to G. G to H. I. inch. r=^04 Position J vertical. ] Two sets of bands superposed. With TBroad set. j 0 Broad and fain 14 t. 30? 40? prism. [_Fine set. 20 36? Too fine to 20unt. Position 1. Position 2. Both sets broader. Both sets finer. l[ o 00 Both sets too fine to count. ordinary and which to the extraordinary pencil, we may proceed as follows Placing a rhomb of calc-spar with a small aperture behind it, so as to give two images, in the same relative position as the plate (see fig. 6) when tne section of the Nicol-prism has its short diagonal per- pendicular to that of the rhomb (1.), E disappears; when parallel (2.) O disappears. In the spectrum, in the former case the finer bands disappear, in the latter the broader. The fine bands therefore belong to E, the broad to O.
    digitised image 1
    digitised image 2
    digitised image 3