The 28 cm Haubitze L/12 in Mittelpivotlafette C/92 was a design of the late 19th century initially intended for coastal defence. Recoil forces were absorbed by a combination of the gun cradle moving up an inclined plane and two hydro-pneumatic or hydro-spring recuperator cylinders, one on each side of the carriage. It was mounted on a turntable which was fixed to a wooden firing platform. For transport it broke down into four loads, the barrel, cradle, turntable and firing platform, each carried by a three-axle trailer. It required three to four days to emplace for firing. An ammunition crane was fixed to the carriage for ease of loading.
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Gander, Terry and Chamberlain, Peter. Weapons of the Third Reich: An Encyclopedic Survey of All Small Arms, Artillery and Special Weapons of the German Land Forces 1939-1945. New York: Doubleday, 1979 ISBN 0-385-15090-3
Hogg, Ian V. German Artillery of World War Two. 2nd corrected edition. Mechanicsville, PA: Stackpole Books, 1997 ISBN 1-85367-480-X