Vol. s3-4, Issue 23, 1872November 01, 1872 EDT
On the Allegheny System of Electric Time Signals
On the Allegheny System of Electric Time Signals
S. P. Langley,
Langley, S. P. (1872). On the Allegheny system of electric time signals. American Journal of Science, s3-4(23), 377–386. https://doi.org/10.2475/ajs.s3-4.23.377