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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 and Edinburgh.