Popular Science Mont lily

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���HAN GAR. S-

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���Power house wtiere current Is qeneraled

��Repair -ihedf

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� ��Fbwerful electric lampi set in two shallow trencher covered with heavy non-breakable plate (^larr

��LANDING G-R.OUND 200 '^ds.

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< 500 ^ds. y!

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^V'ri'r •'^'/'i;^ '■'/im-'f" 'Wirt*^ •"/n'\"'* ■'■"/r;'^'" %,iiiS;'^

���70O yds.

��GASOLINE FLAR.es Tin qasketi containinq raqs and rope fed '»/ith qasoline

���General arrange- ment of a German aerodrome showing the position of the gasoline flares and the trenches cover- ed with unbreaka- able plate glass through which elec- tric lights shine

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��Pole 20 Teet hiqh with red llqht on top -(electric)

��the Germans, not content with the gaso- line flares, dug two shallow trenches, both five hundred yards long and set two hun- dred yards apart inside the "L." These they lined with bright metal to serve as a reflector. A row of powerful electric lights was set in each trench. Over the top, heavy, unbreakable plate-glass was laid on a level with the surface of the ground. The pilot has only to glide down

��on top of the glass in order to make a good landing. If the power-plant should break down, so that no current can be obtained for the lamps, then the flares can be used. The system betrays itself, however. The Allies fly over the illuminated aero- drome at night and drop bombs upon it. As a result, the Germans have had to use their lights only intermittently, and in some cases they had to abandon them.

���are placed covered with heavy, unbreakable plate-glass. The pilots have simply to follow the light and to land on the glass in safety. In addition to electric lights, gasoline flares are used

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