. The railroad and engineering journal . trunnions, but isheld by the teeth or toothed grooves formed in the lower partot the outside hoop. The powder chamber is larger than thebore proper, and the rifling is progressive, with a final inclina-tion which experience has shown to be best adapted to give theprojectile the speed of rotation needed to secure stability anddirectness of tiight. The breech mechanism is of the screwtype, with interrupted threads. The test of this gun consisted of 20 shots, with charges vary-ing from 2O4 to 562 lbs. of powder and projectiles varying from762 to 1,033 bs.
. The railroad and engineering journal . trunnions, but isheld by the teeth or toothed grooves formed in the lower partot the outside hoop. The powder chamber is larger than thebore proper, and the rifling is progressive, with a final inclina-tion which experience has shown to be best adapted to give theprojectile the speed of rotation needed to secure stability anddirectness of tiight. The breech mechanism is of the screwtype, with interrupted threads. The test of this gun consisted of 20 shots, with charges vary-ing from 2O4 to 562 lbs. of powder and projectiles varying from762 to 1,033 bs. in weight. The highest result obtained was 474 THE RAILROAD AND [June, iSgi- with a charge of 562 lbs. of powder and a projectile weighing988 lbs. The muzzle velocity was 2,308 ft. per second ; thecalculated penetration in wrought-iron plate at the muzzle was the arc d k, cutting the line B A extended in h and C A from C as a center, with a radius C d, draw the arc d/intersecting C B aX f. From .5 as a center and a radius B /. ^i;i^i£}::Smj^:v^^!ss£Misiii Fig. 2. THE CANET 32-CENTIMETER GUN. in., or at 2,500 m. (8,200 ft.) it was in. The gunwas in excellent condition after the tests. This gun was made by the Sociiite des Forges et Chanliersat Havre ; its total weight is 145,464 lbs., a little over 72^ will be mounted in a turret of special construction, andhandled by hydraulic machinery. The French papers consider these results excellent, and claimthat the Canet gun has shown itself to be a more powerfulweapon than the Armstrong or the Krupp guns of greaterweight. THE ESSENTIALS OF MECHANICAL DRAWING. By M. N. Forney. (Copyright, 1890, by M. N. Forney.) {Continuedyr«tn page 331.) CHAPTER -iLl.—(Continued.)*AN OVAL. Problem 78. Toconstiuct anovalor egg-shaped figure, fig. 255. If y4 .5 is the width or minor axis of the figure, bisect it at E,and from £ as a center, with a radius A E equal to one-half ofA B, draw the circled C B E, and draw a perp
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
