This volume covers the period January-June 1877. The notes and drawings are by Edison, Charles Batchelor, James Adams, and John Kruesi. Most of the material relates to the speaking telegraph. There are also a few pages devoted to acoustic, multiple, and printing telegraphy. A cover which was apparently used to bind Volume 11 together is still extant and is labeled \"Old Sketches Vol 11 January to July 1877 Pages 203.\"" The volume consists of 203 numbered, unbound pages.\n\n

Pages 105 and 107-110 (Doc. 921 in The Papers of Thomas A. Edison, Vol. 3) have been arranged in their proper sequence: 110, 105, 107, 109, 108.\n\n

Pages 188, 190, 193 (Doc. 944) have been arranged in their proper sequence: 190, 188, 193.\n\n

Numerous pages missing from this volume can be found in facsimile in the Telephone Interferences."