
ROSE TOOLS having petals which are tapered, in contradistinction to I tools similarly used for local correction of optical surfaces but which are simply channeled in the normal manner, turn out to have been the invention of the famous "Uncle John" Brashear. Mirror makers have used such tools for years but their origin has been lost sight of. Porter, in "A.T.M.," 64, describes such a tool.
The rediscovery of the rose tool's origin happened thus: G. Dallas Hanna, a San Francisco advanced amateur mentioned having come across "an interesting paper" in Volume 33 (1884) of the Proceedings of the American Association for the Advancement of Science, and when this paper was looked up it was found to contain evidence that Brashear invented that type of tool. Background is supplied by Brashear's "Autobiography."
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