[279]
could get no lumber for supports to his gallery, but he tore down an old bridge in rear of the lines and utilized that; barrows were wanting, in which to remove the earth taken from the mine, but he bound old cracker-boxes with hoops of iron wrenched from the pork-barrels and used them instead; above all, he needed an accurate instrument to make the necessary triangulations, and although there was a new one at army headquarters, he was forced to send to Washington for an old-fashioned theodolite, and make that answer his purpose.
Despite all this and more, he persevered, working on until