Platinum Crucible: Shaped from Foil in a Hollow in a Board (Morfit, 1849)

A small platinum crucible for igniting precipitates at high heat. Campbell Morfit (1849): "The experimenter himself can in any emergency readily form a crucible out of platinum foil by shaping it with the thumb or a small hammer, in a hemispherical cavity made in a board for the purpose." Platinum crucibles must be of pure metal and hammered, not turned; thin enough to weigh on a delicate balance. Foil thickness and the size of the hollow are not given. Source: C. Morfit, Chemical and Pharmaceutic Manipulations (1849), pp. 196-197. Picture: Fig. 164.