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Show reference lines are PKH) meters apart, or more accurately If the reference lines I are closer together. - j HOW IT'S DONK. I For Instance, the number MT17! Is received as a point to be reamed ry artillery ar-tillery fire. The officer receiving the message finds reference line No. . Then he mentally, or even with a scale dlvidra the apace between that line and the next lire to the right into tenths and notes the fifth one. V being the second digit of the combination received. Next ha mentally men-tally divides the spare In the tenth to the right of th line so fixed Into tenths, and locates the line of the seventh one, the digit "7" btng the third in the received re-ceived combination. Somewhere, on this I'ne. running from the top to the bottom i.f the msp, Is the point st which he ta to fire, .SIMPLE OPERATION. j (.coking down the side of the msp the officer then finds No. 4 reference line running hor! soma I line through the point so found Intersects the vertical line previously pre-viously found at the target. Knowing his own battery's location on the map, it is a simple matter for the officer tnen to find the data necessary for firing at the target. As the target designated by this sys-item sys-item Is but ten meters square, and ordl 1 nary three-Inch or French 7S" ahrap-! ahrap-! nl In bursting spreads over an area ?& , yards wide and M to 7( yards long, the method is sufficiently accurate for ail or- dinry purposes.- Ten meters, or ten ard. figuring roughly, is not a large distribution for machine gunfire at a distance of looe yards and is a small j distribution st a rang of toas yard a. so the method serves equally welt for designating des-ignating targets st which that type of fire is to be directed. INGENUOUS SYSTEM IN MAP WORK ! EMPLOYED Any Designated Point on Map Can Be Transmit- ted by Wireless. By Associated Press. CAMP KKARNV. Cel.. Not. 15 An ingenious atm Is In use In the American Ameri-can army for the location on a map of any designated point. His figures, easily transmitted by wireless or othr Signal methods, do the trick. The only essentia) essen-tia) Is that the point first be located on a map ruled Into squares of the same proportion as those on a msp st ths receiving end. The map need not be the same site or scale, but the reference lines are 1000 meters apart. That is, on a map where one Inch represents a distance of 1000 meters on the ground, the reference , lines will be one inch epsxt. In giving the locations, the first nura- j ber sent indicates th vertical refrretye 1 line. ;enrall maps supplied to ofrt- ' cers cover only the area In which the , are working or expect to work, and these seldom Ivsv mode than ' ten reference lines. If thev are only ten. ihe last digit j of the re fere nc line's number Is Ihe first j figure sent: if more, the reference tine lei Indicated plainly by sending other numbers num-bers preliminary to deMSrnatlng the ftoint. Instanc from left to right on the map Is destgnsted first; distance from bottom j lo top of .the map last. Rach designation designa-tion reejulres three figures, and by means ' of them it ta possible io lo-ate within j ten meters anything on a map where ihe I |