A MAP OF ENGLAND,

SHEWING THE LINES OF EQUAL MAGNETIC DECLINATION
AND THOSE OF EQUAL DIP & INTENSITY.

PRINCIPAL OF AND PROFESSOR OF PHYSICS IN THE CITY AND GUILDS OF
LONDON TECHNICAL COLLEGE, FINSBURY;

LATE PROFESSOR OF EXPERIMENTAL PHYSICS IN

UNIVERSITY COLLEGE, BRISTOL

TWENTY-THIRD THOUSAND

LONDON

MACMILLAN AND CO.

1886

[The right of translation is reserved.]

STEREOTYPED EDITION.