CHAMBERS'S
ENCYCLOPÆDIA

A DICTIONARY OF UNIVERSAL KNOWLEDGE

NEW EDITION

Edited by

DAVID PATRICK, M.A., LL.D.

AND

WILLIAM GEDDIE, M.A., B.Sc.

VOLUME IV

DIOPTRICS TO FREISTADTL

W. & R. CHAMBERS, LIMITED

LONDON and EDINBURGH

J. B. LIPPINCOTT COMPANY, PHILADELPHIA

1924

All Rights Reserved

Printed in Great Britain. W. & R. CHAMBERS, LTD, LONDON 1 EDISBURGH.