cc NATURE 
SECOND-HAND 
SCIENTIFIC INSTRUMENTS 
Swift Advanced Student's Petrological Micnsciey one 
eyepiece and }” objective 
Swift Army B .ct: riological Microscope, 2 eyepieces, Abbe 
condenser and iris... 810 
Watson Grand’ Model Van Heurck Microscope, with 
monocular and binocular bodies, etc. 310 
Zeiss Large Projection Apparatus for Mineralogy, including 
large Nicol prism 28 10 
Zeiss Abbe Apertometer, With metal slide 4 °5 
Cooke & Sons 6” | heodolite ... 25 0 
Troughton & Simms 6” Theodolite 20 0 
Troughton & Simms 14” Dumpy Level . 11 5 
Ross 32” ¥ Level, 24” object glass 1212 
Elliott Box Sextant F 210 
Troughton & Simms 10! Repeating Circle 8 0 
Cary Ar ificial Horizon, Reeves’ patent 40 
Elliott 12” Protractor, with vernier 710 
Wray 4h” Equatorial Astro. Telescope oes ameo'O' 
Cooke & Sons 12” Equatorial Astro. Telescope oo ».1D0 O 
Grubb 6” Fquatorial Astro. eevee Sen ove + 145 0 
Hilger ‘Table Spectrometer #4 me en eet0 10 
Browning Table Spectrometer 1212 
Heele Evershed Svectroscope ... = os soy »reg O 
Zeiss Field Glasses - eee a « from 7 0 
Shepherd Two-day Chronometer daa a. maiz 
Hicks Standard Barometer 9 0 
Zeiss Range Finder cs 15 0 
Heele Half Shidow Saccharimeter __. 15 0 
Lord Kelvin’s Testing Set, No. 18 ... 910 
Besides the above instruments, a large assortment of others, with 
accessories, will be found listed in our 
January Catalogue of 
SECOND-HAND 
SCIENTIFIC INSTRUMENTS 
post free on request. 
% Ne 244 HIGH HOLBORN, 
LONDON. 
Established 1765. 
ecccococoocecsoscosooesoSoSCoSoS CO Oo OX 
SCIENTIFIC INSTRUMENTS 
OF ALL DESCRIPTIONS. 
LABORATORY 
APPARATUS 
Beakers 
Burettes 
Condensers 
Crucibles 
Evaporating Basins 
Flasks 
Filter Papers 
Nitrometers 
Test Tubes 
Thermometers 
Tubing 
Etc. Etc. 
PHILIP HARRIS & GO. 110. 
BIRMINGHAM .. 4 ¢ 
4 
ETB, 
(Estabtishea 1798), Cala 
Manufacturers of Apparatus tor 
CHEMISTRY, PHYSICS, MECHANICS 
hemes METALLURGY, 
and.all Science Subjects. 
Sole Agents in the United Kingdom for Dockartal Sons 
Rotterdam, Balances and Weights. —- 
Townson & Mercer have a staff of glass blowe : 
on the premises; and are in a position to supply blown- 
glass apparatus to clients’ drawings and ~particnlire, 
34 Camomile Street, 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 b 
fuel experts all over the world. It comprises :— 
(1) Bomb or Autoclave, insulated platinum pole, platinum tu’ 
which reaches to the bottom of bomb, four porcelain crucible 
extra lead’ washers, iron fuse, wire, spanners and turnscre’ 
(2) Iron stand, which fixes to bench, to take above a as co’ 
is being screwed on. 
(3) Manometer; on iron stand, with copper tubes and unio 4 
connecting to bomb and oxygen cylinder. 
(4) Two small N.P. brass tubes, with screws for connectir 
the cover of bomb, for H,O and CO, determination: 
(5) One double armed key, with oblong hole to fit ove 
bar on the cover of the bomb. - 
(6) Improved steel mould for compressing caal into briquet 
(7) One nickel plated brass water holder. 
(8) Insulating mantle of stout copper with double walls, to 
filled with water at room temperature. 
(9) One stirring apparatus for working with hand or power. 
(10) One thermometer graduated to 1/100° C. 
(11) Sliding lens for reading thermometer. 
Complete, with full instructions, S3'7 1Os. net. 
Write for List III, Section I, and for our Pamphlet on t. 
Calorimeter, which fully describes the working and 
advantages of the instrument. 
A. GALLENKAMP & CO., Ltd. 
Contractors to the War Office, Colonial and Indian Governments, Crown 
Agents for the Colonies, London County Council, &c. On the Admiralty List. — 
(ENGLAND.) Members of the British Laboratory Ware Association, Ltd. 
19-21 Sun Street, Finsbury Square, London, E.C. . 
Printed in Great B wtain by R. Cray « Sons, Limirev, at Brunswick Street, Stainford Street, S.E., and published by MacMILLAN ANb Co., Limi TED, 
at St. Martin's Street, London, W.C., and ‘He Macrtcan Co., 66 Fifth Avenue, New York.—THuRsvay, February 22, 1917. an 
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