Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 487
re the position of the principal Fraunhofers lines in the solar spec-trum. Let this be done carefully, in brii^ht daylight. A little time givento this measurement will not be thrown away, as it will not require to bedone again. Note down the numbers corresponding to the position of thelines, and… … Fig. 226. way on the distance of these lines apart, but only on the micrometric num-bers attached to them. Let this scale be done on cardboard and preservedfor reference. Now measure the position of the dark bands in any ab-sorption spectra, taking care for this purpose to use lamplight, as…
Inventions
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