"I wouldn't bother you, but it's important and I-I promised a certain party-" The youth's face reddened, his smile widened vacuously.
"Flowing Gold"
Rex Beach
His hearer shrugged and smiled vacuously, then turned away, whereupon Mitchell took him firmly by the arm.
"Laughing Bill Hyde and Other Stories"
Rex Beach
July 20, 1903 767,216 Apparatus for vacuously Depositing Metals .
"Edison, His Life and Inventions"
Frank Lewis Dyer and Thomas Commerford Martin