Self-killed. Failed by Kevan.
Adminned at 12 Mar 2010 02:40:58 UTC
Edit the “Thermometer” Part to read:-
Cost: 1 Wood, 2 Quicksilver, 1 Gem Power Requirement: 5
Monitoring the temperature of a machine can help to improve its operating efficiency. Whenever a Commoner who owns a Thermometer and has an Income below 50 would increase his Coal by his Income, he may instead increase it by his Income plus ten.
Kevan’s wording works better, to prevent potential abuse with repeatedly building and destroying thermometers.
So two commoners with Thermometers can gain free coal (Ten at a time) by trading coal between each other? (So log as they trade only their partner’s income worth of coal.) 
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Keba:
I do not like explanations in such rule (the flavour field would be nice for that) and I think, it would be easer, if you allowed Commoners to increase their Income by ten once.
But, well, nice idea: