A Handbook upon Aeroplanes and their Engines, with Notes upon Propellers. By R. W. A. BREWER, A.M.I.C.E., M.I.M.E., &c. "_... Those who for the present have no intention of trusting themselves on the wings of an aeroplane will still find the book of value; those who already are engrossed in the study of aeronautics cannot afford to ignore it._"--Engineering. _Complete List, Post Free, from_ London: CROSBY LOCKWOOD & SON, 7, Stationer's Hall Court, E.C., & 5, Broadway, Westminster, S.W. _Dependability_ In carburettors there is no greater essential than dependability, and-- The dependability of the White & Poppe is such as ensures a never-failing and invariable efficiency. That's why it is the favourite with many of the leading Airmen of the day. Our Booklet describes it fully, and we shall be delighted to send you copy. WHITE & POPPE, LTD., COVENTRY, ENG. _White & Poppe Carburettor_ BURBERRY AEROPLANE EQUIPMENT. ~DESIGNED BY EXPERTS~ is workmanlike both in design and detail, and permits absolute freedom for arms and limbs. Made in wind and weatherproof Gabardine, lined throughout with Camel Fleece or Quilted Eiderdown, it maintains phenomenal warmth under the severest conditions. ~BURBERRY GABARDINE~ is remarkably airylight, yet affords perfect protection against wind, cold or rain, and is so strong that broken stays cannot penetrate its dense texture. ~Mr. C. Grahame-White~:--"_I take this opportunity of thanking you for the suit I wore on my memorable flight and feel I cannot recommend the material too highly where warmth and comfort are required._" BURBERRYS Haymarket, S.W., LONDON; Boulevard Malesherbes, PARIS; Basingstoke and appointed Agents in Provincial Towns. [Illustration: Burberry Aeroplane Outfit.] SPECIFY "Continental" RUBBER-PROOFED MATERIAL. IT COMBINES MAXIMUM RESISTANCE WITH ENORMOUS STRENGTH, AND IS UNAFFECTED BY ATMOSPHERIC CONDITIONS. WRITE FOR LIST, FREE ON REQUEST. Continental Tyre & Rubber Co. (Gt. Britain) Ld. 3/4, THURLOE PLACE, LONDON, S.W. BLACKBURN AEROPLANES, HYDROPLANES AND PROPELLERS. Write for Prices and Particulars to THE BLACKBURN AEROPLANE Co., BALM RD., LEEDS. 'Phone, 2822 Central. Telegrams: "PROPELLERS," Leeds. HYDROGEN GUARANTEED 99% PURE. LIFTS 70-1/2 LBS. PER 1000 CUBIC FT. THE KNOWLES OXYGEN Co. LIMITED, WOLVERHAMPTON AND BROMBOROUGH (CHESHIRE). PATENTS. Stanley, Popplewell & Co., =INTERNATIONAL AND - - CHARTERED PATENT AGENTS.= _38, CHANCERY LANE, LONDON, W.C._ _Aero and Motor Patents a Specialty._ Instructive leaflet free to any address. Telephone, 1763 Central Telegrams: "NOTIONS, London." Estab. 1879. [Illustration]