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Show GUNFIRE IS MADE SURE BY PHOTOS ?V- furnished with a oomp'ete lithographic and zinogrnphic printing plant and skilled workers, photographers and mathematicians. In a very few hours after the receipt of the day's operations opera-tions from all the various sources, dozens of copies of the corrected mapa are ready for issue to nil the staffs of corps, divisions and brigades comprised com-prised within the army concerned. Nothing is omitted from the maps every church, house, chimney, mill, bridge, road, railroad, group of trees is marked, as well as every turn and twist of an enemy trencli or system of barbed wire entanglements; every stream, ditch, bridge, ford, every path used by supply parties, every point of resistance, organized shell crater, lookout look-out post is shown on the maps. Maps on a very large scale are given when an attack is about to be carried out, so that each officer and man participating partici-pating may know exactly what is in front of him and what he may expect to encounter during his advance. Transferred to Maps They Bring French Artillery to High Efficiency. PROCESS IS NEW INVENTION Every Enemy Object Accurately Recorded Re-corded After Airmen's Scouting of Flights Maps Brought to Date Daily. French Front. Accuracy and efficiency effi-ciency have been made possible for the French artillery by .the invention of an instrument that enables French mapmakers to locate almost exactly an object withiu the enemy lines which has been photographed from an airplane. air-plane. In transferring to a map the photographed object, such as an enemy battery or munition dump, the margin of error is limited to less than five yards. This permits the French artillery to pour its shells with almost certain aim onto German gun emplacements, trench positions, cross-roads, cantonments, canton-ments, railroad lines, aviation camps and other enemy organizations. It is unnecessary for the gunner to have even a distant view of the object he is firing at. Invention Makes Transfer Easy. To take a photograph of the enemy lines from a French airplane is an easy matter, but to transfer the objects ob-jects photographed to their exact location lo-cation on a map was for a time extremely ex-tremely difficult. This was due to the varying heights nnd angles from which the airplane observers made their photographs. By the invention of one of the officers attached to the geographical geo-graphical section, this difficulty has been almost eliminated. Not only the aerial observation service serv-ice but other methods of spotting German Ger-man positions more especially cannon can-non and machine-gun emplacements 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 to his work, but the most important of all is the calculation of the speed of the sound of the firing charge of the German shells. TI14S has been brought to a basis of such perfection that the guns can now be located with almost absolute neenracy. In fact, in recent operations it has proved that the .system .sys-tem of observation by sound has given successful results in over SO per cent of instances. In every army there Is a branch of the geographical section and each is |