TY - JOUR T1 - Calcium as an Absorbent of Gases for the Production of High Vacua and Spectroscopic Research JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 78 IS - 526 SP - 429 EP - 458 PY - 1907/02/02/ UR - http://dx.doi.org/10.1098/rspa.1907.0002 M3 - doi:10.1098/rspa.1907.0002 AU - Soddy, F. AU - Berry, A. ER -