Another day at the chalkboard

This is the man who put 'Watt' into 'Heriot-Watt'.

James Watt was an 18th century Scottish inventor and engineer. He was a great steam pioneer, developing a steam engine design which helped transform Britain and launch it into the forefront of the industrial revolution. By 1800 there were over 500 of Watt's machines in Britain's mines and factories.

Watt also invented the term 'horse-power'. He charged his customers a premium for using his steam engines, and to justify this he compared his machine to a horse. Watt calculated that a horse exerted a pull of 180 lb., therefore, when he made a machine, he described its power in relation to a horse, eg "a 20 horse-power engine". Watt worked out how much each company saved by using his machine rather than a team of horses. The company then had to pay him one third of this figure every year, for the next twenty-five years.

And the other one? He was just a Yorkshire vet.