noisy toys!! (SIMPLEX electric alarm bells)

Because one can never have enough electric noisemakers, right?!! :-)

These three electric bells are all by SIMPLEX TIME RECORDER CO. of GARDNER, MASS. Their various exact model numbers operate at three different voltage levels, the two larger ones are 8" diameter, the smaller one is 6". The red one was likely intended for fire-alarm duty while the gray ones could have been used in any number of signaling systems in a school, factory, or wherever.