6. The types must now be cleaned by picking out any bits of gypsum left in the Interstices ... and lastly they must be brushed; and then done over again for a new mold.
7. The artist, Mr Austen, Engraver can dress and cure any little imperfection in the plates when cast.
8. The Gypsum requires about 2 hours for calcination; and is known to be right when you break the pieces, and see them moulded quite thro'—Matter of Experience.
9. The Gypsum should be broken with small bits about 2 ounces each.
10. and when calcined they are to be ground on a Stone....
11. When the moulds are made, and placed between the marbles ... they will be ready in 2 or 3 hours for baking....
12. They are to be baked being placed upright on stands like those for toasted bread—raised a little from the bottom of the furnace—About 2 hours or 2½hours will take the moulds....
Casting
The metal is precisely the Type metal. The Pots must be made quite as hot as the metal—or rather more—. Then the floating plate must be placed in the frame—and the cake or mould directly upon it with its face downwards: Then place upon the top the cover of the frame, and screw it down: and dip the whole in metal melted so that a match will light at it.—The melted metal will run in at those places made in the mould by the bits of brass—till all be full—and then remove the whole to be cooled on a tile in water with lime upon it—and as it cools and shrinks, supply with fresh melted metal.