42-line fortress and siege gun Pattern of 1877

42-line fortress and siege gun M1877 (Russian: 42-линейная крепостная и осадная пушка образца 1877 года) was a siege gun used by the Russian Imperial Army in late 19th and early 20th centuries. The word "line" in the designation refers to a measurement unit which equals 0.1 inch. Curiously, the "model year" was not the year when the weapon was designed or standardized, but the year when a new rifling system was adopted.

42-line fortress and siege gun Pattern of 1877

42-line fortress and siege gun M1877 (Russian: 42-линейная крепостная и осадная пушка образца 1877 года) was a siege gun used by the Russian Imperial Army in late 19th and early 20th centuries. The word "line" in the designation refers to a measurement unit which equals 0.1 inch. Curiously, the "model year" was not the year when the weapon was designed or standardized, but the year when a new rifling system was adopted.