Thin-glass lamp law
· Physics
A note on how heat leaves a lamp when the glass is thinner than a page.
Abel Watt
Abel Watt taught evening classes in a hall that smelled of coal and chalk. He measured how a lamp loses heat when the glass is thinner than a page. The first paper was rejected for being too short. He sent it again with one extra sentence and the journal kept that sentence as the title.
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Evening-class calorimeter
· Physics
A cheap box that students could build from tin and string.
Chalk-dust conductivity
· Physics
Why a blackboard stays cold after an hour of writing.