ecxlviii 
NATURE 
PRECISION METERS 
FOR ACCURATE MEASUREMENT OF 
GAS or AIR. 
READING BY THE POINTER 
from 1 c.c. upwards. 
MADE IN 40 RANGES. 
Catalogue M.N. on application to:— 
SOLE MAKERS, 
ALEXANDER WRIGHT & CO., Ltd., 
WESTMINSTER. 
SCIENTIFIC INSTRUMENTS 
OF ALL DESCRIPTIONS. 
The “* HARRIS” 
SPECTROMETER. 
A cheap and reliable Instrument specially designed tor 
Students’ use. 
Very strongly constructed so that it may be used by 
elementary pupils without being put out of order, 
PRICE £2 :10:0- Each Net. 
Descriptive Pamphlet on application. 
PHILIP HARRIS & 60., iro. 
_ BIRMINGHAM 
(ENGLAND.) 
[FEBRUARY 12, 1914 
C. Winthrope Somerville’s 
_ SULPHUR 
IN SPENT OXIDE 
TEST. 
A reliable and rapid means of : 
; 
— 
ascertaining the amount of sulphur 
in spent oxide.- 
The result is given in percentage 
of sulphur direct, 
Complete instructions with each test. 
The set complete, £3 3 0 
34 CAMOMILE ST., LONDON, E.C. 
SINKINSON'S APPARATUS 
FOR 
AUTOMATICALLY 
WASHING | 
PRECIPITATES. 
(Patent No. 11352.) 
Full Details, see “Chemical News,’ August 2nd, 1912, page 49. 
TOWNSON & MERCER.| 
The Apparatus has been designed for the 
purpose of Auto’natically Washing Pre- 
cipitates. The old laborious method of 
Washing Precipitates, requiring as it does 
the expenditure of much time and patience, 
is entirely superseded by -this Apparatus. 
This Apparatus can be'seen amongst 
our exhibits at the Science Museum, 
South Kensington, or may be seen work- 
ing at our Showrooms by appointment. 
Write for Circular No.146, which shows the apparatus 
illustrated and priced. 
SOLE MAKERS— 
A. GALLENKAMP & CO., Lid., 
19 & 21 Sun Street, London, E.C. 
St. Martin’s Street, London, W.C., and THe Macmittan Co., 66 Fifth Avenue, New York.—TuHursSDAY, February 12, 914. 
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Printed by RicHarp CLay & Sons, Limirep, at Brunswick Street, Stamford Street, S.E., and published by MacMILLAN AND Co., LimrrEp, at 
