Page "Analytical Engine" Paragraph 13

In 1910, Babbage's son Henry Prevost Babbage reported that a part of the mill and the printing apparatus had been constructed and had been used to calculate a ( faulty ) list of multiples of pi.

This constituted only a small part of the whole engine ; it was not programmable and had no storage.

( Popular images of this section have sometimes been mislabelled, implying that it was the entire mill or even the entire engine.

) Henry Babbage's " Analytical Engine Mill " is on display at the Science Museum in London.

Henry also proposed building a demonstration version of the full engine, with a smaller storage capacity: " perhaps for a first machine ten ( columns ) would do, with fifteen wheels in each ".

Such a version could manipulate 20 numbers of 25 digits each, and what it could be told to do with those numbers could still be impressive.

" It is only a question of cards and time ", wrote Henry Babbage in 1888, "... and there is no reason why ( twenty thousand ) cards should not be used if necessary, in an Analytical Engine for the purposes of the mathematician ".