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"EOT Sound effects. Left
button for Play...Right to Stop"

The picture depicts a segment of a ship's Engine Order Telegraph
with the "order" set on slow ahead, or in other words showing a
"slowbell". Engine orders are called "bells", a carry over from
the days when actual bells were struck. The "code" used was
simple...basically the bell, or gong struck once ( one bell )
for ahead or stop ( from either direction ), and two bells for
astern. Example: From stopped to slow ahead - one bell. From
stopped to astern - two bells. To "hook 'er up", while in either
direction - a "jingle" on a small bell. To go from "hooked up"
astern to "hooked up" ahead - one bell to slow down, one to
stop, one for ahead, and a jingle to "hook 'er up"...three bells
in all, and a jingle. The term "Take 'er on a slow bell", taken
from above, means essentially: "Take it easy".

