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There are no known copyright restrictions in the United States on the use of the text. http://www.archive.org/details/cu31924032188868 MINISTRY OF ARMAMENT AND AUGUST 2S 1917 OF MUNITIONS OF WAR ARTILLERY SUPPLEMENT I TO FORM 983 RANGE TABLES FOR FRENCH 75-/MM GUN MODEL 1897 SUMMARY RANGE TABLES AND CHARTS FOR THE CALCULATION OF THE TOTAL VARIATION IN RANGE CORRESPONDING TO GIVEN FIRING CONDITIONS WASHINGTON GOVERNMENT PRINTING OFFICE 1918 \ MINISTRY OF ARMAMENT AND AUGUST 25, 1917 OF MUNITIONS OF WAR ARTILLERY SUPPLEMENT I TO FORM 983 RANGE TABLES FOR FRENCH 75-/MM GUN MODEL 1897 SUMMARY RANGE TABLES AND CHARTS FOR THE CALCULATION OF THE TOTAL VARIATION IN RANGE CORRESPONDING TO GIVEN FIRING CONDITIONS WASHINGTON GOVERNMENT PRINTING OFFICE 191S Charts for the Calculation of the Total Variation in Range Corresponding to Given Firing Conditions. FOREWORD. The following charts are the embodinfient in graphic form of Table VII of "Range Tables for French 75-mm. Gun, Model 1897," of August 25, 1917, giving variation in range due to variation : da in weight of liter of air. Wa; in longitudinal component of wind. dN in muzzle velocity. df in weight of projectile. Each network drs (or Wx, dY, dp) of the chart has been constructed by plotting the range X as ordinate against the variation in range as abscissa . The curves of the net- (Dotted line.) work correspond to 10 mmg. variation in da, 1-meter variation in Wx, 2-meter variation in dV, and 50-gram variation in dp for shrapnel or 1 weight zone for explosive shell. USE OF 1 NETWORK SEVGLY. (Example: Chart Vl-a for 75 mm. sbrapnel.) From the way in which the charts have been constructed, the variation in range at a range X (such as 6,500 m.) for a variation da (such as +80 mmg.) in the weight of a liter of air are gotten by following the curve corresponding to the variation da { + 80) and marking the point on this curve that corresponds to the range (6,500 m.). The point thus found hes between two dotted ordinates, —150 m. and —175 m., and corresponds approximately to the ordinate 165 m. This length represents the definite variation in range due to a variation da (80 mmg.) in the weight of a liter of air. A precisely similar operation would be made to determine the variation in range due to each of the disturbing causes (dV, Wx, dp) taken separately. USE OF THE NETWORKS IN GROUPS OF TWO. To find the variation DX in range corresponding to simultaneous variation da in the weight of a liter of air and Wx in the longitudinal component of the wind, join the points on the da and Wx networks corresponding to the given fiiring conditions by a straight line. At the point where this line cuts the scale ® , the sum of the two separate variations may be read both in magnitude and sign (for instance, — 165 m. + ( — 85 m.) = — 250 m.). By a similar operation on the pair of networks for dV and dp (as for the case when X = 6,500 m., dY= —7 m., p = 7.5 kg.) the magnitude and sign of the variation DjX due to firing con- ditions dV and dp may be read at the intersection of the line through the points corresponding to the latter with the scale ® (for instance, D2X= —65 + 25= —40 m.). USE OF THE COMPLETE SET OP CHARTS TO DETERMINE THE TOTAL VARIATION IN RANGE. To determine the total range variation DX^D^X + DaX, it is sufficient to complete the figure by joining with a straight line the two points on the scales ® and ® obtained by the direc- tions given above. The intersection of this line with the central scale ® gives in magnitude and sign the total range variation DX (for instance, -40 m.+ (-250 m.) = —290 m.). Approved : Paris, August 25, 1917. For the Minister and by His Order. General in Charge of Artillery, RONNEAUX. 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