This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...of the invisible. To see indirectly what cannot be seen direct is the province of the spectroscope. The spectroscope consists of a prism or train of prisms which disperse white light into a rainbow-tinted ribbon known as the spectrum, made up of rays of diflerent wave-length from violet at one end to ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...of the invisible. To see indirectly what cannot be seen direct is the province of the spectroscope. The spectroscope consists of a prism or train of prisms which disperse white light into a rainbow-tinted ribbon known as the spectrum, made up of rays of diflerent wave-length from violet at one end to red at the other. Now it is a property of a gas, through which light passes, to absorb certain of the rays peculiar to itself, and so form dark lines across the spectrum at those points. Most of the lines thus observed in the solar spectrum come from gases in the photosphere of the sun, but there are certain others which arise in our own atmospheric envelope and are called telluric lines in consequence. Such are the oxygen and water-vapor bands. If now another planet, such as Mars, possessed either of these gases in its atmosphere, the light reflected from it should disclose the fact by deepening these bands. Much was hoped from the spectroscope on this point. Up to and beyond the time when the lectures were written, of which this book is the outcome, the spectroscope had not proved itself a sufficiently delicate in strument to give other than an uncertain answer on the presence or absence of water-vapor on Mars. Huggins, Vogel, Janssen, all thought to see evidence of it there; Campbell, with more accurate instruments, could find none. Nor could any be obtained under still more favorable conditions of air and instrument at Flagstaff. The reason for inconclusion, though unsuspected at the time, lay in the position of the bands in the spectrum produced by water-vapor. These begin, indeed, in the yellow, are present in the orange and light red, but are broadest and darkest in the partially visible deep red and in the invisible spectrum beyond...
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