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This volume contains the printed record of testimony on behalf of Edison from two patent interferences in 1881. The spine is stamped "Edison Testimony Edison vs. Siemens vs. Field Electric Railroad" and "Edison Testimony Keith vs. Edison vs. Brush On Dynamo Electric Machines 1881 Chas. Batchelor."

The volume comprises the following cases:

1. Edison v. Siemens v. Field. This 218-page pamphlet contains testimony by Edison, Charles L. Clarke, Francis R. Upton, and other associates concerning Edison's efforts to design and construct an electric railroad at Menlo Park in 1880.
2. Keith v. Edison v. Brush. This 119-page pamphlet contains testimony by Edison, John Kruesi, Francis R. Upton, and other associates concerning Edison's work on the dynamo between 1878 and 1881. Edison's testimony also contains significant references to his activities between 1869 and 1873.