In 1905, the red car waiting room at the station at Sixth and Main replaced its departure “annunciator” electric bell with “sweet-toned triangles of steel,” and put one in the women’s waiting room too.

So I devised a machine somewhat on the plan of the hotel annunciator that was invented long afterward, only mine was a great deal more complex.

Tools, bells, batteries, unusual circuits, burglar alarms, annunciator systems, thermostats, circuit breakers, time alarms, and other apparatus used in bell circuits are described from the standpoints of their application, construction and repair.

He then investigated the subject of telegraphy, and in 1867 patented a telegraphic switch and annunciator.

Luther challenged the pope and his devotees to justify portions of their creed and practices, and Calef did the same to Cotton Mather, as a leading annunciator and expounder of the witchcraft creed.