[The following note describes a series of notebooks and has no document records attached to it. For that reason, a "no Documents found" message will appear if the "List Documents" button at the bottom of the note is used. To see the records in the notebooks described here, use the "Which Series Notes?" button to enter the Series Notes or use the "Next Text" button to move to the first item in the series.]

These two notebooks were used by Leroy E. Briggs, Zachariah P. Halpin, and A. L. Townsend in 1914 for experiments on miner's safety lamps. The books describe work with batteries, brass reflectors, bulbs, and other parts of the lamp. Also included are designs for new lamp fixtures and tests of candle power with various lamps. Some of the entries pertain to the testing of locomotive headlights. Related material can be found in Kinetophone and Kinetoscope Experiments -- L. E. Briggs Books, N-13-03-18.2 [selected] and N-13-05-22, N-13-12-30.2, N-13-11-07 [not selected]; Battery Experiments -- Experimenters' Books -- Paul D. Payne Book, N-20-11-01; and General Experiment Books -- Z. P. Halpin Books, N-13-03-14 and N-14-07-26.