My interest in this was initially aroused because upon reading the email, I remembered that an old text book from 1950, Machine Shop Methods, (reprinted in 1998), showed a 'Heavy Duty Boring Tool Holder' which I was sure was similar, if not identical, to the one illustrated in issue 235. I do not have the M.E. article to which Ian Strickland referred so cannot confirm if it is the same but it seems very likely given the details illustrated in the 1950's text book (it does appear to be so - Ed.). The book, by Lorus J. Milne, was originally an American publication and gives construction details of a good number of tools, jigs and fixtures in Chapter 17 entitled 'Useful Tools and Fixtures.' From this, two line sketches of such holders are reproduced in fig. 1 where the similarity to the holder in photo 1 is, I think, quite clear. It is described as a heavy duty item providing excellent support for stiff boring bars taking heavy cuts.
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机译：最初引起了我的兴趣，因为在阅读电子邮件时，我想起了1950年的一本旧教科书《 Machine Shop Methods》（于1998年重印）显示了“重型镗刀架”，如果可以的话，我确信它很相似。与第235期中说明的内容不同。我没有Ian Strickland提及的ME文章，因此无法确认是否相同，但考虑到1950年教科书中的详细说明，它似乎很有可能（是的-Ed。）。这本书由Lorus J. Milne撰写，最初是美国出版物，在第17章标题为“有用的工具和固定装置”的章节中详细介绍了许多工具，夹具和固定装置的构造细节。由此，在图2中再现了这种支架的两个线草图。我认为，与照片1中的持有人的相似性很明显的1。它被描述为一种重型产品，可为重型切割的硬质镗杆提供出色的支撑。
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