Physical description
Article by Yvonne Aitken and F.R. Drake for Royal Society of Victoria, Reprint from Proc. Roy. Soc. Victoria, Vol. 53, Pt.II (New Series) 1941
Article by Yvonne Aitken and F.R. Drake for Royal Society of Victoria, Reprint from Proc. Roy. Soc. Victoria, Vol. 53, Pt.II (New Series) 1941