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Calculate the number 744

NUMBERMANIA: Calculate the number 744 using numbers [4, 2, 6, 9, 61, 737] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 38

The first user who solved this task is Sanja Šabović.

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Small child picked

'I was not a particularly small child. I was the one who always got picked to play Bethlehem in the school nativity.'

Jo Brand (July 23 1957-)

Picture: Craig Sugden

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Compound steam engine patent

In 1781, a British patent was taken out for the first compound steam engine by Jonathan Carter Hornblower (No. 1298). His invention was to use two cylinders of unequal size attached to the same beam. Steam acts first in a small high-pressure cylinder, leaving at a lower pressure, but still sufficient to expand further in a larger cylinder. Although he claimed greater efficiency, this was not realised at the low steam pressures of the day. Boulton and Watt claimed infringement on their earlier patent since this engine still used a separate condenser, so Hornblower had to abandon that design at the time. His compound steam engine principle was later revived in 1804 by Arthur Woolf using higher steam pressure with better results.«

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