Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1939.MIT copy bound with: Spectroscopic study of hydrated manganese chloride crystals / Walter A. Hargreaves. 1939. -- The absolute determination of the Curie unit / Alva L. Herman. 1939. -- Temperature control device employing a Rochelle salt crystal / Robert C. Hilliard. 1939. -- The x-ray investigation of the crystalline structure of Rochelle salt, Na K C₄H₄O₆. 4H₂O / Lloyd P. Hunter. 1939.