It is true that the modern electrical arts have been a great Stimulator of copper production, now taking a quarter of all made; yet evidently but for such inventions as this such arts could not have come into existence at all, or else in growing up they would have forced copper to starvation prices.
"Edison, His Life and Inventions"
Frank Lewis Dyer and Thomas Commerford Martin
A weekly prayer-meeting, always attended by one of the professors, though officially rather than as a Stimulator, was much in the manner and spirit of similar exercises at Andover.
"Recollections and Impressions 1822-1890"
Octavius Brooks Frothingham
Yet, with all that, he was a serene and benignant figure, of an inspiring optimism, a fine patriotism, and profound intellect-a Stimulator of the best in man.
"American Men of Mind"
Burton E. Stevenson