Alfred M. Henry as a Discoverer. A Memorial of Joseph Henry. Washington: Government Printing Office: 475–508. 1880 [2007-09-23]. Alexander Graham Bell and
拉斯·卡岑巴赫也来到了礼堂门口。卡芩巴赫告诉华莱士靠边点站,但华莱士拒绝移动,并且发表了一篇关于州权理论的演讲。亨利·格雷厄姆(英语:HenryV. Graham)将军则对华莱士说:“先生,在合众国总统的命令之下,我得到一个十分让人悲哀的职责:请你让开。”(Sir, it is my sad duty