When a joint was calked, the bell piece was then separated, 1915 April 1, Gas Age, volume 35, page 328:
To make an indentation in the edge of a metal plate, as along a seam in a steam boiler or an iron ship, to force the edge of the upper plate hard against the lower and so fill the crevice.
(alt-of, alternative) Alternative form of caulk (“to take a short sleep, nap”).
From French calque, ultimately derived from Latin calcō (“to trample”). Doublet of calque.
Meanings
To copy (a drawing) by rubbing the back of it with red or black chalk, and then passing a blunt stylus or needle over the lines, so as to leave a tracing on the paper or other thing against which it is laid or held.