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In article <1310017@hpcilzb.HP.COM> doug@hpcilzb.HP.COM (Doug Hendricks) writes:
>1.  A battery that can be trusted after 100 years of storage,

100 years of *storage*, or 100 years of low-level *use*?  If it's not
required to produce current during those 100 years, almost any of the
schemes which separate solid and liquid components until activation
would do.  For example, an ordinary lead-acid battery with the acid
stored in a glass container until activation time.  Actually providing
current for 100 years would be much trickier; better would be to have
a set of good separate-component batteries activated in succession, so
an individual battery isn't required to be active that long.

>2.  A clock of some sort to alarm after 100 years.

This should not be hard if you can supply power.  I'd guess that high-
reliability digital electronics should last that long, especially if you
make it triple-redundant against minor failures.
-- 
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