Smooth-bore cannon and mortars of cast-iron and bronze are still retained in some fortresses, though rifled cannon are the only type now made. 佚名.神奇的知识之书.
Military cannon are divided into three classes, based upon the length of caliber, and technically known as guns, mortars and howitzers. 佚名.神奇的知识之书.
These early cannon, bombards, and mortars were mounted on heavy solid wooden frames and moved with great difficulty from place to place. 威廉·亨利·杜利特.世纪发明.
Howitzers form a class between guns and mortars in length. 佚名.神奇的知识之书.
The coast defense artillery consists of the 8-, 10-, 12- and 16-inch guns and the 12-inch mortars. 佚名.神奇的知识之书.
Being shaped internally and externally like an apothecary's mortar, they were called mortars or bombards. 威廉·亨利·杜利特.世纪发明.
There were women grinding dried plantain in crude stone mortars, while others were fashioning cakes from the powdered flour. 埃德加·赖斯·巴勒斯.人猿泰山.
In guns the length is relatively great, in mortars relatively small, compared to their calibers. 佚名.神奇的知识之书.
A regiment of Kentucky volunteers guarded the mortars and howitzers engaged against Black Fort. 尤利西斯·格兰特.U．S．格兰特的个人回忆录.
What about the mortars? 欧内斯特·海明威.丧钟为谁而鸣.
About the same time Comminges of France invented mortars which threw projectiles weighing 550 pounds. 威廉·亨利·杜利特.世纪发明.
Shells were invented by the Italians and fired from mortars, but their mode of construction was preserved in great secrecy. 威廉·亨利·杜利特.世纪发明.
The fort had an armament of 21 guns and 3 mortars on the land side, and 24 guns on the sea front. 尤利西斯·格兰特.U．S．格兰特的个人回忆录.
They are made up to 27 seconds burning time for guns of 2,600-foot seconds muzzle velocity, and up to 36 seconds for mortars and guns of 1400-foot seconds muzzle velocity. 佚名.神奇的知识之书.