Re-Engineering History: A Playful Demonstration

Special Collections & Archives, Templeman Library Tuesday 9 October 2018, 17:30 – 19:30

Presented by Tom Ritchie and the ‘Meccanomen’

When asked to think about computers, what is the first thing that comes to your mind – maybe the big ones, like Steve Jobs and the iPhone, Bill Gates and the Microsoft computer, or Alan Turing and Enigma?

But very few of us would think of Douglas Hartree and his Differential Analyser. Yet, before the Second World War, in 1934, Hartree and this analogue computer were at the forefront of computing, both in Britain and abroad. In fact, the Hartree Differential Analyser was the first analogue computer of its kind to be built in the U.K.

What are analogue computers? Analogue computers rely on the mechanical movement of continuously changing physical quantities to create answers. Whereas digital computers – the laptops and smartphones that shape our world today – resolve equations, using binary language (i.e., in the form of 0 and 1).

Put simply, if you could look at analogue computers in action, you would actually be able to see an equation move through them mechanically, from the input table, through the integrating units, to the answers that are drawn by the output table.

This was the genius behind Douglas Hartree’s alternative approach to computing. His analyser was only the beginning. It led to the development of a number of other machines, which were used during the Second World War to calculate anti-aircraft ballistics trajectories, and equations relating the Dam Busters Raid, and the Tube Alloys initiative (Britain’s own nuclear weapons programme).

What makes the Hartree Differential Analyser even more impressive is the unlikely material it was built with. Forget diodes and motherboards, Douglas Hartree and his research student Arthur Porter constructed one of the world’s first computers from the children’s toy Meccano.

Come along to a unique seminar and demonstration on Tuesday, 9 October to learn about how a children’s toy was used to build this incredible analogue computer (and maybe get your hands on some Meccano). Then step back in time to see a rebuilt Meccano model of the differential analyser calculate once again.

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