Электронная книга

The Practical Gold-Worker, or, The Goldsmith's and Jeweller's Instructor in the Art of Alloying, Melting, Reducing, Colouring, Collecting, and Refining: The Progress of Manipulation, Recovery of Waste, Chemical and Physical Properties of Gold; With a New System of Mixing its Alloys; Solders, Enamels, and Other Useful Rules and Recipes.