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433 STRAND, LONDON.

MANUFACTURER of Patented Induction Coils, other Scientific Instruments and Engineering Appliances to the Government Departments.

JOINTLESS SECTION COILS, my system or 1868, to order, to in. Coil, 4000 ohms R, very thick discharge. Primary Coils for 10 to 230 volts. COMMERCIAL SERIES OF COILS, as Fig., at about one-half of catalogue prices.

Maker and Designer of the following Coils:POLYTECHNIC, 29 in. park.

SPOTTISWOODE, 44 in. spark.

THE SOUTH KENSINGTON COIL, 48 in. spark. Special Coils for
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NEW TRIPLE-POLE MERCURY BREAK, giving a stream-like effect
when used with Apps' Patented Induction Coil (this can be fitted to
any Induction Coil), £6 6s.

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TOWNSON & MERCER.

ESTABLISHED 1798 (OVER A CENTURY).

RETAIL-89 BISHOPSGATE STREET WITHIN, E.C. WHOLESALE-34 CAMOMILE STREET. E.C.
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C. E. MÜLLER, ORME & CO.'S

N.B. The official test at the Charlottenburg Institute showed that with this glass the alkali dissolved by 100 c.c. of distilled water is milligrammes as

compared with milligrammes dissolved from Jena glass under the same conditions.

Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 6 Fifth Avenue, New York.-THURSDAY, March 3, 1905.

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