<div class="description">
<p>Three typical gases, hydrogen, argon, and helium, have been experimented on to study the variations of line intensity with definite variations of current and pressure. The gases were enclosed within special Plucker tubes having glass or porcelain capillaries, operated by alternating current at 5000-10,000 volts. With hydrogen the readings were made on the lines H/sub alpha /, H/sub beta /, H/sub gamma / in the secondary spectrum, and on small regions near lambda lambda 611, 545, 460 in the primary spectrum. The red line is found to vary more rapidly with the current density than the other line. The primary spectrum showed no apparent selective change even at the highest currents. With variations of pressure from 0.25 mm. to 10 mm.
</p>
<br>Subjects: spectra</div>
Internet Archive identifier