CIXXXV1 
NATURE 
[JANUARY I, 1914 
CONDENSERS 
High Tension (60,000 v.) 
MOSCICKI TYPE 
VARIABLE 
TUNING TYPE 
ALUNDUM 
EXTRACTION 
THIMBLES 
For rapid filtration, without 
previous preparation. 
Unaffected by solutions of acids 
or alkalies used in ordinary 
Quickly dried 
to constant weight. 
analytical work. 
Diameter 25 mm.; height 70 mm., 
(Low Tension) 1/8 each. 
iameter mm.; hei 8 ea 
ISENTHAL’S PATENT aes 
ISENTHAL & CO. 
(Department 1), 
DENZIL WORKS, NEASDEN, LONDON, N.W. 
Contractors to the Admiralty, War, India, and 
Colonial Offices, &e, 
SCIENTIFIC INSTRUMENTS 
OF ALL DESCRIPTIONS. 
The “* HARRIS” | 
SPECTROMETER. 
Lemna || esmmanat 
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 & C0, 
(1913) 
LTD. 
Manufactured by the Norton Co., 
Mass. 
SOLE AGENTS: 
TOWNSON & MERCER.| 
34 CAMOMILE ST., LONDON, E.C. 
-BERTHELOT-MAHLER 
BOMB CALORIMETER. 
With Modified Bomb by Dr. K. Kroeker. 
FOR SOLID AND LIQUID FUELS. 
We specially recommend the following set, which is used by 
fuel experts all over the world. 
It comprises the following parts :— 
(1) Bomb or Autoclave, enamelled inside, insulated platinum ; 
pole, platinum tube which reaches to the bottom of bomb, 
four porcelain crucibles, extra lead washers, iron fuse, wire, 
spanners and turnscrew. 
(2) Iron stand, which fixes to bench, to take above whilst cover 
is being screwed on. 
(3) Manometer, on iron stand, with copper tubes and union for 
connecting to bomb and oxygen cylinder. 
(4) Two small N.P. brass tubes, with screws for connecting to 
the cover of bomb, for H,O and CO, determinations. 
(5) One double armed key, with oblong hole to fic over the 
bar on the cover of the bomb. 
(6) Improved steel mould for compressing coal into briquettes. 
(7) One nickel plated brass water holder. 
(8) Insulating mantle of stout copper with double walls, to be 
filled with water at room temperature. 
(9) One stirring apparatus for working with hand or power. 
(10) One thermometer graduated to 1/100° C., with Physical 
Technical Reichsanstalt’s certificate. 
(11) Sliding lens for reading thermometer. 
Price of Parts 1-11 complete, with full instructions, 
#30 net. 
| Write for Circular N.126a and for our descriptive pamphlet on 
this Calorimeter, which fully describes the working 
at 
| and advantages of this instrument. 
A. GALLENKAMP & CO., Ltd., 
| 19-21 Sun Street, Finsbury Square, London, E.C. 
BIRMINGHAM 
(ENGLAND.) 
Printed by Ricuarp Cay & Sons, Limirep, 
St. Martin's Street, London, W.C., and 
pb, at Brunswick Street, Stamford Street, 'S.E., and published by MacmiLLan AND Co., LIMITED, at 
THE MacMILLAN Co., 66 Fifth Avenue, New York.—THuRSDAY, January 1, 1914. 
