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- Newsgroups: rec.railroad
- Path: sparky!uunet!spool.mu.edu!uwm.edu!linac!att!att!dptg!ulysses!ulysses!smb
- From: smb@research.att.com (Steven Bellovin)
- Subject: Re: High Speed Rail Questions
- Message-ID: <1993Jan2.013659.18532@ulysses.att.com>
- Date: Sat, 2 Jan 1993 01:36:59 GMT
- Distribution: na
- References: <921230173224@cream.ftp.com> <38217@cbmvax.commodore.com> <1992Dec31.131431.28136@ryn.mro4.dec.com> <1992Dec31.223800.27170@ee.ryerson.ca>
- Organization: AT&T Bell Laboratories
- Lines: 13
-
- In article <1992Dec31.223800.27170@ee.ryerson.ca>, cal@ee.ryerson.ca (Calvin Henry-Cotnam) writes:
- > The ingredients were powered iron oxide, aluminium shavings, and
- > potassium permanganate as a catalyst. A short strip of magnesium was
- > used as a "fuse". The fuse was ignited and it burned down to ignite
- > the mixture to produce the reaction.
-
- A minor nit -- the potassium permanganate was almost certainly *not*
- a catalyst. A catalyst remainds unchaged by the reaction; it merely
- facilitates it. If I recall correctly, potassium permanganate will
- give up some of its oxygen very easily; this lets the initial aluminum
- burn at a high temperature. And that, in turn, is sufficient to
- ignite the rest of it, where the aluminum robs oxygen from the iron
- oxide.
-