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Attention is directed to the following topical articles which have
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The "WILLETT" GENERATOR

BUNSENS WITHOUT COAL-GAS

The difficulties of carrying out analytical work in Mine Laboratories on account of absence of gas supply, can be completely overcome by the self-contained "Willett Petrol AirGas Generator. The "Willett" Petrol Air-Gas System has now been adapted so that bunsens, heating rings, blowpipes and gas heated muffles can be used in any part of the world however remote from civilisation.

The "Willett " Generator which enables this to be done, is compact and can be shipped either complete ready for erection, or if necessary, in parts. It is well designed, strongly built, and all the parts liable to rust are in brass and will consequently last for many years without replacements of parts. The Generator is weightdriven and the only daily attention it requires is to wind up the weights and to refill with petrol. The introduction of the "Willett" Petrol Air-Gas system into your laboratory will mean that you can conduct almost every heating process with the same ease as you would be able to do in London.

Write for Booklet "T," which gives full particulars of this system, and if possible, visit the Showrooms at Sloane Square, London, S. W., where a full demonstration can be seen.

W. WILLETT, 37F, Sloane Sq., London, S.W. Established over 40 years.

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Exploring.

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Please write for CATALOGUE

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The Deposits of the Useful Minerals & Rocks; Their Origin, Form, and Content. By Dr. F. BEYSCHLAG, Prof. J. H. L. VOGT,

and Dr. P. KRUSCH. Translated by S. J. TRUSCOTT, Associate Royal School of Mines, London. In 3 vols. Vol. I. Ore-Deposits in General-Magmatic Segregations-Contact-Deposits-Tin Lodes-Quicksilver Lodes. With 291 Illustrations. 8vo. 18s. net.

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It

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Fine Chemicals for Research Purposes. Prof. H. B. BAKER, F.R.S.; Prof. J. F. THORPE, F.R.S.; M. A. WHITELEY.-A Penalty on Research. Prof. SYDNEY J. HICKSON, F.R.S.-The_Prices of Chemicals. J. J.; A FIRM OF DEALERS IN CHEMICALS.-British Supplies of Laboratory Ware. C. A. MERCER.-Problems of Radiation. (With Diagram.) Prof. C. G. BARKLA, F.R.S.-The Green Flash. Prof. ALFRED W. PORTER, F.R.S.-Trenching Ground and Spraying Potatoes. SPENCER PICKERING, F.R.S.-Early Representations of the Giraffe. (Illustrated.) Dr. C. R. EASTMAN.-The

Economic Status of the Blackcap. ALFRED O. WALKER ; WALTER E. COLLINGE.-The Rusting of Iron. SUMNER.

E. J.

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A MANUAL OF HIGH SPEED ENGINE.

DYNAMOMETERS.

A STUDY OF THE CIRCULAR-ARC BOW-GIRDER.

M.Inst. C.E.

GIBSON, D.Sc.,

A Text-Book for

2nd

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THE

STEAM

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INDUSTRIAL CHEMIS- By ALLEN ROGERS and A. B. TRY.

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