...self-supporting chum within the mould normally of corresponding and almost the same but lesser contour, whereby a space is provided between the chum and mould for the introduction of the powdered material and means for expanding the chum'.
1920, The South African Journal of Industries, volume 3, part 2, p. 820
He uses a round slab of clay, which he places on top of the chum and commences to thump down around the sides.
1921, A Survey and Analysis of the Pottery Industry, bulletin no. 67, trade and industrial series no. 20, Washington: Federal Board for Vocational Training.
Chum,—A mold used on the whirler to hold ware for scraping and finishing.
1972, Neal French, Industrial Ceramics—Tableware, Oxford University Press
Now that shapes were more uniform this was usually done on a horizontal lathe with the bowl automatically centred on a wooden chum
This is a more useful method: it is used in making oval casseroles. The liner is made by spreading a bat and tehn forming it over a felt-covered chum, oval in shape.
Chum or chuck: Lathe attachment for holding pots during turning process.
Borrowed from Englishchum
chumm (pluralchums, feminineblondeorchum de fille)