Kettle
A vessel of iron or other metal used for the purpose of heating or boiling liquids, or melting metals. The common method of moulding a kettle with the spindle and sweep-board is to first strike a core, answering to the inside, upon a foundation-plate; then strike a sand thickness over it corresponding to the outside, the impression of which is taken in the cope built on a surrounding cope-ring that bears the whole outside structure. After separation, the thickness is removed and moulds finished, when the cope is returned to its place, and, after due preparation, the space is filled with molten metal.
The following table shows the weight of spherically shaped kettles when the depth is equal to half the diameter of core, and one inch thick: Inside diameter in inches. 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 Weight in pounds. 590 791 1022 1281 1570 1889 2237 2614 3021 3457 3923 4418 4492 5496 6079 See SPINDLE; SWEEP-BOARD; FOUNDATION-PLATE; COPERING; THICKNESS; CASING.