โ Scribed by Lancton, H. M.
No coin nor oath required. For personal study only.
The discovcry of helium rnnlts irs one of the grent ircliicvciueuts 6f cliemicnl science. Prior to 1917 this rcmnrbable chemicnlly inert gns wns littlc more t h i t t i curiosity of the Inborntory, the gns bciug described in tho t.est-boolis 11s oiic of the rare girscs ol the utiiiusplierc. l'ct lor t,lic ycur cudiug Juuc 30, 1030, uu miouiit of ucnrly ten iiiilliou cubic feet of tho gns ivus soparirted from thc nirturnl gas of the petrolcuiii iicltls, this nchicveinent bciiig but cruotlicr of tlic iiiirtiy coutributions iiinde by the pctrolcuni : i t i d iinturiil giis iieltls to industry. 'Ilic discovery in 1'3P'J iu Coloriido of 11 iitrtiiriil 31s eontiiiiiiiig 7% of Iicliuiii, following ns it did 011 the successful tvorld cruise of tho * ' Grnf Zeppelin," crented rcucwcd iutcrest in tlic giis. Tlic disiistrous loss of the British nirsliip li 101 over E'riincc in October, 1930, oiicc iiiorc urousett ~iiiblic iutcrcst iu the gim, :tiid led to i; good den1 of ill-iiiforiiied comincnt on tlic fnilurc to usc llic girs in British :rirsIii~~s. l u lS6Y Sir Xormnn Lockyer, cngiigcti in spectroscopic csuuiiuntiou of tlic sun's ~~l ~o l l l o S ~J h C r ~ during tlie totirl s o h cclipsc of tl1iit p t r , discovered ii yello\v liue ueirrly coiiicitlcnt with tlic double liue corrcspoiitliiig to sodium, wliicli lie tleuotctl us D,.
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While it will be seen mainly as a reference book, it is in fact more valuable than that, since the articles are written as reviews and mostly in styles which are both informative and enjoyable.