The enemy had in addition to their intrenched line close up to Petersburg, two enclosed works outside of it, Fort Gregg and Fort Whitworth. 尤利西斯·格兰特.U．S．格兰特的个人回忆录.
The guns of Fort Gregg were turned upon the retreating enemy, and the commanding officer with some sixty of the men of Fort Whitworth surrendered. 尤利西斯·格兰特.U．S．格兰特的个人回忆录.
These were supplied in England from 1811 to 1840 by the genius of Bramah, Clement, Fox, Roberts, Rennie, Whitworth, Fletcher, and a few others. 威廉·亨利·杜利特.世纪发明.
The hydraulic pressure for this 5,000-ton press is furnished by Whitworth pumping engines. 佚名.神奇的知识之书.