Elementary Aeronautics: Or, the Science And Practice of Aerial Machines
Elementary Aeronautics: Or, the Science And Practice of Aerial Machines
Thurston, Albert Peter
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— Diagram illustrating the principle of the high-tension magnet. Digitized by VjOO^ iC AERONAUTICAL ENGINES. 103 primary circuit, which causes a current to flow. This current is suddenly broken by means of the contact breaker, and this induces a current of high potential in the secondary circuit, from which it is led away to the distributer con- nected to the sparking pluga Petrol Commercial petrol is a mixture of various lighter liquids of the paraffin series, which have the chemical formula o...f the order of Cn B.2H+2. Commercial petrol, having a specific gravity of '72 at 15° C, is composed principally of a mixture of hexane and heptane — CgH^^ and CyH^g. The lightest petrol or gasolene supplied, having a specific gravity of about '64, is composed almost wholly of pentane — CgHjg. This very light petrol is now being used for flying machines. It will be seen from its chemical formula that it contains more energy per lb. weight than the others, owing to the increased proportion of hydrogen.
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