I found this link while looking for zipper etc:

www.energy.gov/aboutus/history/firsts.hist_mo.html

The entry:

"
September 12, 1956

The world's first nuclear powered lighthouse, the "Baltimore Light," on
the Chesapeake Bay in Maryland, went into operation. A 60-watt
radioisotope nuclear generator, 34 1/2 inches high, weighing 4,600 pounds,
supplied a continuous flow of electricity for 10 years without refueling.
"

Implies that this generator had an energy density of about 8MWh/kg. Uhh.

This is relevant to the previous thread about thermopile generators etc.

Peter

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics