TY - JOUR T1 - Observations and Photographs of Black and Grey Soap Films JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 77 IS - 517 SP - 314 EP - 323 PY - 1906/03/29/ UR - http://dx.doi.org/10.1098/rspa.1906.0028 M3 - doi:10.1098/rspa.1906.0028 AU - Stansfield, H. ER -