XXIV 
IN THE PRESS. 
NEW CATALOGUE 
RHEOSTATS 
FOR THE 
LABORATORY, 
TEST ROOM, 
AND OTHER PURPOSES. 
ISENTHAL & GO. 
(Department 1), 
DENZIL WORKS, NEASDEN, LONDON, N.W. 
Contractors to the Admiralty, War, India, and 
Colonial Offices, &c. 
\ 
SCIENTIFIC INSTRUMENTS 
OF ALL DESCRIPTIONS. 
The “HARRIS.” 
SPECTROMETER. 
r Seca 
ef 
A cheap and reliable Instrument specially designed for 
Students’ use. 
Very strongly constructed so that it may be used by 
elementary pupils w.thout being put out of order, 
PRICE £2: 10:0 Each Net. 
Descriptive Pamphlet on application. 
PHILIP HARRIS & CO., iro. 
‘BIRMINGHAM 
(ENGLAND.) 
TOWNSON & MERCER.| 
LTD. 
(Established 1798), 
Manufacturers of Apparatus tor 
CHEMISTRY, PHYSICS, MECHANICS, 
BACTERIOLOGY, METALLURGY, 
and all Science Subjects. 
LABORATORIES FURNISHED AND COMPLETELY EQUIPPED. 
Apparatus for Students’ Use. 
Sole Agents in the United Kingdom for 
Becker’s Sons’, Rotterdam, Balances and Weights. 
Agents for the Glassware of Josef Kavalier and Schott & Gen. 
and Schleicher & Schiill’s Filter Papers. 
Contractors to the Home and Colonial Departments of H.M. Government, 
War Office, India Office, Imperial College of Science and Technology and 
the Universities and Principal Technical Institutions, County Councils, &c. _ 
34 Camomile Street, London, E.C. 
Davies’ Combined Crucible Furnace 
and Tripod Stand. 
Over 3,000 sold. 
It consists of :—A fireclay 
body with asbestos outer 
covering, sheet-iron jacket on 
three teet and metal chimney. 
It can be used for reductions, 
fusions, 
incinerations, and 
melting of metals and alloys, 
up toatemperature of 1050’, 
C., which is above the melt- 
ing point of silver. 
When not in use as a crucible 
furnace, it takes the place of 
an ordinary tripod stand and 
flame protector, thus offering 
a useful combination. i 
Marble is readily reduced in 
this furnace. 
Price complete, with Bunsen 
Burner, 4/6 each. 50/- dozen. 
REGISTERED_NO. 455539- 
Mr. A. E. Dunstan, B.Sc., F.C.S., of the East Ham Technical 
College, E., after using one of the above furnaces, wrote :— 
“*] have put the small furnace you sent me to several tests and 
find it works admirably. 
Copper was melted in 20 minutes, 
Brass + A ove os Pe 10 1 
German Silver was melted in- ..: tee XO Pe, 
Seeing that it derives its heat from an ordinary Bunsen 
burner, I regard it as highly efficient for general 
laboratory use and is likely to become very popular. 
I intend to use it myself for ignitions which otherwise would 
\necessi ate the use of the blowpipe.” 
Also stocked in 2 larger sizes, 
Circular, No, 10, post free. 
A. GALLENKAMP & CO., Ltd., 
19 & 21 SUN STREET, Finsbury Square, LONDON, E.c. 
Printed by RicHarp Cray & Sons, Limirep, at Brunswick Street, Stamford Street, S.E., and published by MACMILLAN AND Co., LimirEp, at 
St. Martin's Street, London, W.C., and THz Macmittan Co., 66 Fifth Avenue, New York.—Txurspay, September 12, 1913. 
