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LONG WAVES MOST ABSORBED. 253
COLOUR OF WATEE AND ICE.
(«■)
The sun is continually sending forth waves of different
lengths, all of which travel with the same velocity through
the ether. When these waves enter a prism of glass they
are retarded, but in different degrees. The shorter waves
suffer the greatest retardation, and in consequence of this
are most deflected from their straight course. It is this
property which enables us to separate one from the other
in the solar spectrum, and this separation proves that the
waves are by no means inextricably entangled with each
other, but that they travel independently through space.
In consequence of this independence, the same body
may intercept one system of waves while it allows another
to pass: on this quality, indeed, depend all the phenomena
of colour. A red glass, for example, is red because it
is so constituted that it destroys the shorter waves which
produce the other colours, and transmits only the waves
which produce red. I may remark, however, that scarcely
any glass is of a pure colour; along with the predominant
waves, some of the other waves are permitted to pass.
The colours of flowers are also very impure; in fact, to
get pure colours we must resort to a delicate prismatic
analysis of white light.
It has already been stated that a layer of water less than
the twentieth of an inch in thickness suffices to stop and
destroy all waves of radiant heat emanating from an obscure
source. The longer waves of the obscure heat cannot get
through water, and I find that all transparent compounds which contain hydrogen are peculiarly hostile
to the longer undulations. It is, I think, the presence of
AH
II
»!
| Title | Tyndall, John, 1860, The Glaciers of the Alps. |
| Alternative Title | Glaciers of the Alps. |
| Creator | John Tyndall 1820-1893. |
| Subject |
Glaciers -- Alps. Alps -- Description and travel. Color. |
| Publisher | London : John Murray ... |
| DateOriginal | 1860 |
| Format | Tiff |
| Extent | 33 cm. |
| Identifier | col022 |
| Call Number | QE576.T914 1860 |
| Language | English |
| Relation | Color Science |
| Collection | Ice - 19th Century Polar Exploration & Glacial Studies |
| Rights | http://www.lindahall.org/imagerepro/ |
| Data Contributor | Linda Hall Library, LHL Digital Collections. |
| Title | Page 253. |
| Creator | John Tyndall 1820-1893. |
| Subject |
Glaciers -- Alps. Alps -- Description and travel. Color. |
| Publisher | London : John Murray ... |
| Format | tiff |
| Identifier | col022288 |
| Call Number | QE576.T914 1860 |
| Relation-Is part of | Is part of: The glaciers of the Alps : Being a narrative of excursions and ascents, an account of the origin and phenomena of glaciers, and an exposition of the physical princples to which they are related / By John Tyndall... |
| Relation | Color Science |
| Rights | http://www.lindahall.org/imagerepro/ |
| OCR Transcript | LONG WAVES MOST ABSORBED. 253 COLOUR OF WATEE AND ICE. («■) The sun is continually sending forth waves of different lengths, all of which travel with the same velocity through the ether. When these waves enter a prism of glass they are retarded, but in different degrees. The shorter waves suffer the greatest retardation, and in consequence of this are most deflected from their straight course. It is this property which enables us to separate one from the other in the solar spectrum, and this separation proves that the waves are by no means inextricably entangled with each other, but that they travel independently through space. In consequence of this independence, the same body may intercept one system of waves while it allows another to pass: on this quality, indeed, depend all the phenomena of colour. A red glass, for example, is red because it is so constituted that it destroys the shorter waves which produce the other colours, and transmits only the waves which produce red. I may remark, however, that scarcely any glass is of a pure colour; along with the predominant waves, some of the other waves are permitted to pass. The colours of flowers are also very impure; in fact, to get pure colours we must resort to a delicate prismatic analysis of white light. It has already been stated that a layer of water less than the twentieth of an inch in thickness suffices to stop and destroy all waves of radiant heat emanating from an obscure source. The longer waves of the obscure heat cannot get through water, and I find that all transparent compounds which contain hydrogen are peculiarly hostile to the longer undulations. It is, I think, the presence of AH II »! |
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