Gentle mans Calling

§ 13. [L., prop. an annunciator (a-nun'si-a-tor), n. nuntiator, adnuntiator, mechanical, hydraulic, pneumatic, or electrical signaling apparatus; an indicator; a call. In the mechanical annunciators the pulling of a wire causes a bell to ring and a word or number to be displayed which indicates whence the signal comes. In the hydraulic systems a column of water is used to convey an impulse which gives the signal. In pneumatic annunciators pre ure on a bulb or button sends through a pipe a puff of air by which a bell is rung and a number displayed. In the electrical systems the signals are given by closing an electrical circuit by some See cut under indicator. (c) The dial or suitable means. board on which the signals are displayed.