Harold, I think you misunderstand the message that folks are trying to get across. The text might be translated correctly, but it is quite likely that the translators were scholars. During much of the time that translations were made scholars were sheltered from those doing any type of manual labor and were unlikely to understand very much about any of the trades. Think of cloistered monks and illuminated texts. Alternately think of Diderot's encyclopedia and the huge number of technical errors in describing many of the trades and what they did.
Dave Anderson
Chester, NH