Scientific American Volume 85 Number 10 (September 1901) . The F inished Gun on a Rapid Fire-Pedestal The Core of Involuted Sheets Assembled Ready for Winding. from bore to circumference, and every particle of themetal does its share of useful work. The system ofbuilt-up construction has undoubtedly been broughtto a high stage of excellence, as shown by the factthat modern built-up guns secure a muzzle velocityof 3,000 feet per .second with a maximum chamberpressure of 17 tons to the square method of securing the desired initial compres-

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