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Show NEW INSTRUMENT FOR MAPMAKERS 1 French Enabled to Locate Ac-' Ac-' curately Any Object Photographed Photo-graphed From an Airplane. FRENCH FRONT. April 10. (COT I respondence of the Associated Press ) j Accuracy and efficiency haYC bean I made possible for the French artillery I by the Invention pi an instrument! that enables French map makers to lo- I .rate nlmost exactly an object within ; the enemy lines which has been pho- i Itographed from an airplane. In trans-! fening to a map the photographed 1 object, such say, as an enemy battery or munition dump, the margin or error. is limited to less than five yards. This permits the French artillery to I pour Its shells with almost certain aim on to German gun emplacements. I trench posit ions, cross roads, canton I ments, railroad lines, aviation camps and other enemy organisations It is j unnecessary for the gunner to have even a distant view of the object he Is firing at. To take a photograph of the enemy lines from a French airplane j, an easy matter but to transfer the objects photographed to their exact location on a map was for a time extremely difficult dif-ficult This was due to the varying heights and angles from which the airplane air-plane observers made their photographs photo-graphs By the Invention of one of the officers attached to the geograph leal section this difficulty has been almost al-most eliminated. Aerial Observation Service Not only the aerial observation service serv-ice but ether methods of spotting German Ger-man positions more especially cannon can-non and machine gun emplacement. are utilized as aids to the work of the military map maker. The flashes of : guns as they are fired from the German Ger-man side form one valuable adjunct In hiu ivr.rlr hilt t h f most IlIlDOrtant Of 'all Is the caluculation o fihe speed of' the sound of the firing charge of the j (,erman shells This has been brought I 1 to a basis of such perfection that the guns can now be located with almost absolute accuracy. In fact In recent operations it has proved that the sys-l i tem of observation bv sound has clven i successful results in orer 80 per cent I of instances. I In every army there is a branch of the geographical section and ea h Is ! furnished with a complete lilhgraphic i and ziuographic printing plant and skilled workers, photographers and mathematicians In a very few hours after the receipt of the day's observations obser-vations from all the various sources, dozens of copies of the corrected maps are ready for issue to all the staffs of corps, divisions and brigades comprised com-prised within the army concerned. Everything On Maps. Nothing is omitted from the maps i I church, house, chimney, mill, bridge, 1 I road, railroad group of trees is ' marked as well as every turn and twist of an enemy trench or system of ' barbed wire entaglements. every ' stream, ditch, bridge, ford, every path used by supply parties, every point of resistance, organized shell crater, lookout post is shown on the maps Maps on a ver large scale are 1ti D when an attack is about to bo carried out, so that each officer and man participating par-ticipating may know exactly what is in front of him and what he may expect ex-pect to encounter durlnq his advun . no |