The seven notebooks in this group cover the period February 1899-February 1904. They were used by Edison employees P. F. Cowing, H. M. Phillips, John O. Roos, and Nils Traaholt. The entries in N-03-11-16, by Traaholt, are stamped by Frank L. Dyer. The books contain logs and experimental notes relating to meter tests, which were probably done for the Edison Illuminating Co. of New York. The meters tested are mechanical rather than electrolytic or electrochemical.