..."Those tubes sticking from the bottom contain something you arefamiliar with: non-burning and non-explosive helium gas... 
Various 「Astounding Stories of Super-Science, June, 1930」
...This bit ofpower is carried into the helium tubes, and by a system of vacuumpower, is increased millions of times...
Various 「Astounding Stories of Super-Science, June, 1930」
...The element helium was firstisolated by Ramsey some twenty-sevenyears later...
Various 「Astounding Stories of Super-Science April 1930」
...It was full of bright lines of hydrogen, calcium, helium, andothers not identified...
George Forbes 「History of Astronomy」
...As with the other Novæ, when it first dashed into thenebula it was vaporised and gave a continuous spectrum with dark lines ofhydrogen and helium...
George Forbes 「History of Astronomy」
...It was, therefore, supposed to be caused by somehitherto unknown body to which the name of helium, or the sun element,was given...
Robert Stawell Ball 「The Story of the Heavens」
...The helium line of the latter had never been noticed to bedouble...
Robert Stawell Ball 「The Story of the Heavens」
...Thus the identity between thecelestial helium and the gas found on our globe was established in themost remarkable manner...
Robert Stawell Ball 「The Story of the Heavens」
...The cloud-like prominences consistmainly of hydrogen, with helium and calcium, while many metals arepresent in the eruptive discharges...
Robert Stawell Ball 「The Story of the Heavens」
...Its spectrum shows that it is composedchiefly of hydrogen, calcium and helium, in the state of vapour...
Cecil G. Dolmage 「Astronomy of To-day」
...Type B (Orion type, Helium stars)...
Carl Vilhelm Ludvig Charlier 「Lectures on Stellar Statistics」
...The quiescent prominences, whose elevation is often from forty thousand to sixty thousand miles, consist, as the spectroscope shows, mainly of hydrogen and helium...
Garrett Serviss 「Curiosities of the Sky」
...Here againwe have hydrogen and helium represented by bright lines, while theorigin of the remaining bright lines is doubtful...
Robert Stawell Ball 「The Story of the Heavens」
...The helium lines have vanished...
Carl Vilhelm Ludvig Charlier 「Lectures on Stellar Statistics」
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