The times. [volume] (Washington [D.C.]) 1897-1901, 1901-01-13

| II ouly lildt duNduCes
were made the instrumental equipment
should keep pace with them. Spectre
scopes were built on a larger scale: more
prisns. which meant greater dispersion,
| were employed to render the measure
| rnents OF the lines in spectra more accu-
rate. The growth of our knowledge espe-
| cially necessitated the making of maps OF
| the lines in the solar spectrum, and in
the spectra of the chemical clements
| which had been compared with it on
natural scale. This was done by Ang-
stron. who utilized for this purpose the
difraction grating invented by Fraun-
hofer, and defined the position of all lines
In spectra by their wave lengths" in ten
millionths Of a millimetre or tenth
| metres
| In 1862 Rutherford extended Fraunhn-
! fer's work on the stars by first attempt
at classification. Two years later Hug
| gins and Miller produced maps of the
spectra of some stars. Denati demon
strated that comets gave radiation spectra
and Higgins did the same for nebulae-
By these observations comets and neb-
ulae We're shown to be spectroscopically
different from stars which at that time
We're studied by their dark lines only.
-, r,,,sa.-,.,-
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-, -. - ,,,tfot ; .
VI -, 'iie - -,
vance in our knowledge.
| -. -, .t,,tr
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Jul 80 'ii'' '"e ~ -,
-. -, H., ,,,a -, 70.
| If movement of STARS toward or from the
o,rtb or the ,,nrt,sb or downrush of
| a., scrar ,.,oo-s on tho SIMS disk can he
| ,..u..,,. ,I..o.,r,f,,o, o., fu-,bar u.iliza-
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| - -, g., 81. ~
.c -. -. =, 1t, ,,,,,,.,s
pe'i % INC - '''e -
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|
| lAi- Fhoio'nArh L
| Wedsewood & baVy' IN lS'z- hahe prints
on paper oS means Oh siiver sai's' oue II
was not uiitii io'5 ,nal -,'e' -
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| =, - e.. =, - i..i1.,.-
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| 80 ttat he had fourd . nau, If,d Of
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|