V. Note on the spectrum of hydrogen
Joseph Norman Lockyer · Proceedings of the Royal Society of London · 1880
Abstract Some years ago, in an account of a research undertaken by Dr. Frankland and myself, it was pointed out that in the tubes we then employed the h line of hydrogen was only seen when the coil and Leyden jar were so arranged as to produce those effects which are generally supposed to be due to high temperatures. The remark, as we distinctly stated, was only made in connexion with the tubes we then employed, which were of widish bore; it is necessary to mention this because in Germany the remark has been taken to apply to all tubes. In connexion with my present line of work I have had to return to the spectrum of hydrogen, and I have photographed it, using an end-on tube, which I owe to the kindness of Dr. Monkhoven, whose device it is. In the spectrum of the Monkhoven tube h is very well seen, though not so strong as the line near G.