Stationary steam engines, simple and compound; especially as adapted to electric lighting purposes (1890)
Thurston, Robert Henry, 1839-1903 · New York, J. Wiley & sons · leaf 235
dered. These instruments, being absolutely automatic, give testimony that isnever doubted, and do their work with perfect certainty and invariableexactness. They never forget and never make a mistake. A pointer anddial give the same indications as are seen on the old form of indicatinggauges, and… … This Instrument gives records simultaneously of the steam or watepressure and of the speed of engines or machinery. Both are recordeupon the same chart, continuously and accurately. The width of the loops in above tracing (lower line) indicate the lengof time the speed was interrupted—as of a train…
Steam-engines
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