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Leonard Robinson, Modern Poultry Husbandry, published by Crosby Lockwood & Son Ltd, London, 1948, pages 330-331.

In case it adds more information, this is a complete how-to from my old 1940s poultry husbandry manual (which is very thorough, if a little dated). Apologies if the photos are a bit small and hard to read. In answer to one of the questions in the middle of this thread, my assumption (never...