Definition:Babbage's Analytical Engine/Mistake

Source Work

 * analytical engine or difference engine
 * analytical engine or difference engine

Mistake

 * analytical engine or difference engine
 * a mechanical precursor of the modern digital computer, including a punched-card reader and a memory storage device, of which the principle was described by in $1834$, but which was never completed.

Correction
What is being described here is Babbage's analytical engine, which was a completely different machine from Babbage's difference engine.

The latter was being worked on from as early as $1819$.

Neither were actually fully constructed in 's lifetime, but $2$ working difference engines were constructed in the late $20$th century and early part of the $21$st century.