Elementary practical physics / Newton Henry Black, Harvey Nathaniel Davis. Black, Newton Henry, 1874- [from old catalog] Davis, Harvey Nathaniel, 1881- [from old catalog] joint author. Physics. QC23 .B65 530.7 BLE Includes index. New York, The Macmillan company, 1949. 1949. 1938 Text viii, 710 p. : eng