...“Liquid helium... 
Various 「Astounding Stories of Super-Science, March 1930」
...I developeda cold light under whoserays helium would liquefy and remainin a state of equilibrium until exposedto light rays...
Various 「Astounding Stories of Super-Science, March 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」
...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」
...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」
...Three are due to hydrogen;two (discovered by Copeland) are helium lines; others are unknown...
George Forbes 「History of Astronomy」
...Its spectrum shows that it is composedchiefly of hydrogen, calcium and helium, in the state of vapour...
Cecil G. Dolmage 「Astronomy of To-day」
...About a dozen less conspicuous lines were graduallyidentified in the spectrum of the prominences and the chromosphere,which appeared also to be caused by this same mysterious helium...
Robert Stawell Ball 「The Story of the Heavens」
...c), the spectra of which are distinguished by the presence of brighthydrogen lines and the bright helium line D3...
Robert Stawell Ball 「The Story of the Heavens」
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