In order to facilitate the comprehension of the details of the art of flying, the lecturer introduces his talk with a brief classification of the vehicles of the air, critically analyzes in a pupular way the scientific principles upon which the lighter-than- air and heavier-than-air machines are built and clearly explains the superiority of the latter.      The lecturer then goes on and leads his audience into a miniature aviation field where, with the aid of a six-foot monoplane model (equipped with electric motor) and original steriopticon views showing the latesst development in the art of flying, he demonstrates in a clear and comprhensive way, the working medfhanism of the flying machine. Interspersing his lecture with interesting personal incidents which he has experienced with his pupils, he also illustrates the fifferent stages through which an aviator passes from the time he begins grass-cutting and

Mr. Jerwan surrounded by his pupils in front of a monoplane, watching the flight of a fellow-pupil.

follows closely the fledgeling's progress, including his experiences and smash-ups, up to the time when he becomes a full-fledged man-bird. Also, Mr. Jerwan gives scientific explanations, accompanied with stereopticon views, of the performances in describing a large vertical (S); and looping the loop with an aeroplane in the air. Likewise he demonstrates to his audicence the fear of meeting with an accident, even if the machine, while in mid-air is upset, drops perpendicularly, turns sidewise, slides longitudinally or falls backward on the tail, provided, of course, that the aviator keep cool, gathers courage and exercises self-mastery in the manipulation of his craft. Referring to aeroplane accidents, Mr. Jerwan attributes the occurrance of most of them to a lack of knowledge of the principles underlying the art and science of flying, and asserts that

 

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