LETTER LXVIII. The Method of Communicating to Steel the Magnetic Force, and of Magnetizing Needles for the Compass: the Simple Touch, Its Defects; Means of Remedying These.
LETTER LXVIII. The Method of Communicating to Steel the Magnetic Force, and of Magnetizing Needles for the Compass: the Simple Touch, Its Defects; Means of Remedying These.