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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.
Beginner
Unknown
Instructions
1
1
Read Morfit
Read Morfit
"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."
2
2
Make the hollow
Make the hollow
Cut a hemispherical cavity in a board, the size of the crucible wanted. Morfit's crucibles hold from a fluidrachm to three fluid ounces; a half-ounce one is the most needed in analysis. How the cavity is cut is not given (ours: a gouge in a hardwood board).
Tools needed:
Hardwood Board
Gouge
Unknown Dimensions3
3
Shape the foil
Shape the foil
Lay a piece of pure platinum foil over the hollow and press it in with the thumb, or work it in with a small hammer, until it takes the hemispherical shape. The foil thickness, and how the foil is made, are not given (unknown).
Materials for this step:
Platinum1 foilTools needed:
Hardwood Board
Ball Peen Hammer
Unknown Forming Method4
4
Care of the crucible
Care of the crucible
Blisters and flaws that appear after use come from impure metal and bad workmanship; remove them by the force of a small hammer. Loosen salts with boiling water and rub off stains with sand or pumice stone. Do not use sharp pointed instruments on it.
Tools needed:
Ball Peen HammerTools Required
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