p. 160: "Mörser": caliber of 61 cm Journal des Sciences Militaires, 2nd series, Vol. 22, Paris 1838: caliber of 22 pouces = 59,6 cm (p. 49); outer diameter
The 5-inch (127 mm)/54-caliber (Mk 45) lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in (127 mm) L54 Mark 19 gun on the Mark 45
"quadruplet" and refers to the four 20 mm autocannon constituting the design. The Flakvierling weapon consisted of quad-mounted 2 cm Flak 38 AA guns with collapsing