On Welding and Brazing.

The rub of the thing is the flux. When you direct the hot oxy-coal gas flame or the very much hotter oxy-acetylene flame upon a piece of metal, you can see that metal glow and then liquify in the heat, you can see the liquid rippling about prettily under the flame's force, but on the upper surface of the liquid lies a dross of oxide, and therein lies the welder's main difficulty; you may sweep the crust away and see momentarily the naked surface of the flowing metal, but before anything can be done with it, the crust has formed again. The object of a flux is to clear that oxide away.

There are many fluxes on the market, but Mr. Critchett, of the Critchett Welding and Engineering Company, seems to

TUITION.

THE TEMPLE SCHOOL OF FLYING.-Thorough tuition, flying and constructional, by qualified staff. Two types, Blériot pattern Monoplanes, Caudron Biplanes. Fees, 58 (including everything). Exhibition flights arranged. Passenger flights from £2 25.Temple, Aerodrome. Hendon.

THE COURSE OF TUITION AT THE GRAHAME

WHITE AVIATION SCHOOL is based upon a very comprehensive knowledge of the needs of pupils. The instructors have had much experience, and pupils are assured of obtaining their brevets with as little delay as possible.-Write for prospectus to THE GRAHAME-WHITE SCHOOL, LONDON AERODROME OFFICES, HENDON, N.W.; or, 166, PICCADILLY, W.

efforts" in this direction. The metals which are to be welded with the aid of the flux need not even be cleaned prior to the process, for the compound will not only clear away rust, but dirt and any product of corrosion that may have accumulated upon the metal's surface. Furthermore, only a very small quantity of this flux is necessary to attain the purpose. By this means not only may steel be welded to steel and copper to copper, but steel to copper, iron to bronze, or brass or anything. Aluminium, the most difficult metal of all to deal with, becomes docile as clay in the hands of the potter. Aluminium strip is produced in the composition of which this flux is involved; by means of this strip the joining of aluminium becomes almost as simple as soldering.

Regarding the efficiency of steel welded joints made according to this process, Mr. Critchett has joined up -inch strips of steel, end to end, and has had the resulting strip reduced to half the thickness (1-16 inch) by cold rolling; in one or two cases the metal's edge in the neighbourhood of these welds has shown a tendency to fray. The reason of this tendency is understood and will probably be overcome when the present experiments are completed, meanwhile it is believed that no steel-welded joint has ever passed so satisfactorily through such an abnormal and exacting test.

Novavia to the Fore.

The British-built Bréguet recently delivered to the Royal

Flying and practical construction. Thorough tuition for ordinary and superior brevets.

If you seek the best machine and the best equipped School, enquire what the Ewen pupils are doing on the Caudron.

VICK

W. H. EWEN AVIATION CO., LTD.,
London Aerodrome, Hendon.

ICKERS, LTD.-AVIATION SCHOOL at Brooklands. Thoroughly graded tuition from slow biplanes to fast monoplanes.

HERBERT SPENCER FLYING SCHOOL, Brook:

lands Aerodrome, Weybridge. Tuition and practical constructional work, £50. Passenger flights from £2 25. LTD.-Hydro

EASTBOURNE AVIATION plane

biplane, biplane and monoplane tuition. One of the best equipped schools in England. Bleriot, Bristol, and Farman machines. Exhibition and Passenger Flights. For terms and full particulars, apply AERODROME, Eastbourne.

TUITION FOR AIRSHIP PILOT'S CERTIFICATES.

as also

(Including necessary preliminary training in Spherical Balloons, and covering usual insurance risks). Special terms and facilities for Officers of the

All Advertisements for this column should arrive at this office by 6 p.m. MONDAY, to ensure insertion. For the convenience of Advertisers, replies can be received at the office of THE AEROPLANE, 166, Piccadilly, W. Special PREPAID Rate-18 words 1/6; Situations Wanted ONLY-18 words 1. Id. per word after.

WILLOWS AIRCRAFT COMPANY, LTD., London Aerodrome, Heudon.

1) UCROCO & LAWFORD, LTD., School of Aviation,

Brooklands Aerodrome; thorough tuition on passenger-carrying propeller and tractor biplanes, the types used in R.F.C.; extra practice for qualified pilots; exhibition and passenger flights; terms moderate.

MACHINES.

DUNNE PATENT SAFETY AEROPLANES, single

and two-seater types, mono or biplane.-THE BLAIR ATHOLL AEROPLANE SYNDICATE, LTD., 1, Queen Victoria Street, London. Tel. 834 Bank.

ANTED immediately, cheap for cash, several aero engines and machines.--Write Box 504, c/o THE AEROPLANE, 165, Piccadilly, W.

MONOPLANE, £75 for quick sale. Bargain. Fitted

with 50-h.p. Anzani engine.-Wood and Co., 5, Cheapside, Manchester.

FOR SALE. 50-h.p. Blériot monoplane, complete in every respect, less engine. Newly overhauled and exceptional bargain. £65-Box 505, c/o THE AEROPLANE, 166, Piccadilly, W.

ENGINES WANTED.

NZANI ENGINE WANTED; new or second-hand;

MODELS.

QUALITY" Model Monoplanes, fly in any

-Box 500, c/o THE AEROPLANE, 166, Piccadilly, W.

HARDWOODS for Aeroplanes Air-dried Timber,

specially selected, as supplied to leading constructors. Silver Spruce, Ash, Parang, Mahogany, Hickory and Ash Skids, Walnut, Three ply. Laminated blocks, guaranteed perfect timber supplied for propellers.WM. MALLINSON AND SONS, LTD., 130, Hackney Road.

wind.

30s. Write for Booklet and also list of the successful high-efficiency Chauvière INTEGRAL Model Propellers. THE W. R. DING COMPANY, 24-32, Villa Road Handsworth, Birmingham.

CARS FOR SALE.

DALMER'S GARAGE,

PALME

requiring a motor-car, cycle-car, or motor-cycle at a low price, write to Palmer's Garage, Tooting, for No. 2 of new monthly booklet, containing illustrations and details of nearly 10 motor vehicles. Palmer's Garage, Tooting.-This week's bargain, 15-h.p. Darracq five-seater, four-cylinder; ready drive away; has hood, screen; sell for £20.

Palmer's Garage, Tooting, has in stock nearly 100 new and second-hand automobiles of all kinds, including Mercedes, F.I.A.T., Renault, Darracq, Humber, Rover, Singer, Crossley, Talbot, Panhard, Napier, Daimler cars, etc.

Palmer's Garage, Tooting, is also the recognised mart for cycle-cars; leading makes are in stock; new and second-hand at bargain prices.

Palmer's Garage, Tooting, hold auction sales every fortnight, and can sell your car or aeroplane on terms of no sale no charge, but 7% per cent. on realisation. Sale address, L. N. Palmer's Garage, Tooting (20 minutes Victoria, 10 minutes Wimbledon). Write for auction catalogue. Next three sales, August 20th, September 3rd, and September 17th, at 2 o'clock.

For the Aviation Student

TH

HOSE who have followed flying for the last year or two know that 1911 and 1912 were perhaps more full of interest than any other period of the history of modern flight.

Many important and historic contests and events were held, most of them at Hendon, and a record of the Hendon events is practically a record of British flying events during that period. This record is contained in the fascinating little book, "Flying at Hendon," which gives interesting and accurate accounts of the First Aerial Post, the First Aerial Derby, the First Night Flying demonstration, and other important happenings.

Many famous aviators have flown at Hendon, and their portraits are given in this book. Much other useful information, intensely interesting to the aviation student, is also included. Copies of this book can be obtained from the London Aerodrome Offices, 166, Piccadilly, London, W., at 7d. each, post free.

THIS ILLUSTRATION

is taken from the cover of a handy little book which tells you all you want to know about the Flying at Hendon. A copy will be forwarded post free to any address on application to The London Aerodrome Offices, 166, Piccadilly, London, W.

SPECIAL ARTICLES IN
RECENT HENDON

PROGRAMMES.

During the present season each weekly Programme has contained an instructive article on some aviation subject. A number of programmes containing the following articles have been reprinted, and copies can be obtained from the London Aerodrome Offices, 166, Piccadilly, for 1d. each, post free.

1. Portrait and Career of Louis Noel. Biography of Wilbur Wright. "The Wright Biplane" (Illustrated).

2. Portrait and Career of Jules Nardini. "Flying Weather," by Miss M. L. Elliot. 3. Portrait and Career of I ieut. Porte. "The Deperdussin Monoplane" (Illustrated).

4. Portrait and Career of Rebt. Slack. "The Morane-Saulnier Monoplane (Illustrated)

5. Portrait and Career of H. M. Brock. 6. Portrait and Career of Sydney Pickles. "The Evolution of the Monoplane' (Illustrated).

7. Portrair and Career of Marcus D. Manton. "How Aeroplanes Fly."

8 Portrait and Career of Norman Spratt "Aviation Terms and Expressions," (Illustrated)..

9. Portrait and Career of G. Lee Temple. "Aeroplane Types" (Illustrated).

10. Portrait and career of Claude GrahameWhite. "How an Airman learns to Fly." 11. Portrait and Career of Richard T. Gates. How an Airman Finds his Way."

ALL ABOUT THE

FLYING AT HENDON

THE LONDON AERODROME. 1913 SEASON