Читать книгу The Complete English Wing Shot онлайн

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Chronographic testing for time over a range has never proved very satisfactory, for the instrument makes but one record of time for 300 different pellets, which are known to vary in velocity over some ranges by 300 foot-seconds, and in striking velocity by 200 foot-seconds.

This was brought out by the late Mr. Griffith, who as manager of the Schultze gunpowder works had great opportunities, and took them. Powder-makers may very well use the chronograph in testing powders at 10 yards range. At this range Mr. Borland of the E.C. Company informed the writer that he could never find a difference between small shot and large pellets; which goes to prove that at the distance they have not scattered longitudinally enough to make the chronograph the absurdity it becomes when it records one time for 300, all various.

But once the chronograph was used for small shot on the right principle. This was when Mr. Griffith applied it to his revolving target experiments.

Description of gun and load.Length of shot column at these ranges in yards as previously accepted.How the length of column was obtained.102030405060Choke bore 12 gauge, 49 grains Schultze, and 1⅛ oz. shot2¼ feet4 feet6¾ feet3¼ yards4¼ yards4½ yardsBy actual measurement on the Griffith revolving targets, assuming velocity of shot to be only 200 f.s.—the same as that of target11 feet19 feet27 feet33 feet35 feetBy multiplying the length of actual measurement as above by the ratio of shot speed at the end of the range above the 200 f.s. of the revolving targetsThe same gun and load, but with only 42 grains Schultze powder20 inches40 inches6 feet9 feet12 feet4¼ yardsAs in first line above8 feet15 feet22 feet28 feet29 feet...As in second line aboveCylinder gun 12 bore, 42 grains of Schultze powder, and 1⅛ oz. shot2¾ feet5 feet7½ feet4 yards4½ yards4¾ yardsAs in first line above11 feet22 feet28 feet35 feet30 feet...As in second line above

This table is only inserted because the figures contained in it have hitherto formed the bases of public knowledge and calculation; it is corrected and superseded by another on page ssss1. Its errors consist in no deduction for the natural spread of the pattern and in the multiple adopted being based on the striking velocity of the first five per cent. of pellets.