'The constant and severe testa to which air craft are being put in military and naval operations all over the world have already produced several improvements in' the machines, while experience of ya ing atmospheric conditions made aviators much more skilful and the performance of their take more certain. Aviators have been employed in China, Egypt, all the theatres of war in Europe and in several parts of Africa. Something has been heard of frozen petrol, but nothing like so much as might fairly have been expected. One of the causes of the success of the British laters is said to be their training in gusty, storm-swept Britain, whereas on the continent of Europe conditions do not change ea rapidly. I the newly-invented stabilizer, working on the principle of the
Text read from the printed page and cleaned; old type leaves the occasional error.