Sketch of the Analytical Engine invented by Charles Babbage, Esq.Menabrea, Luigi Federico
Science
Sketch of the Analytical Engine invented by Charles Babbage, Esq.
Menabrea, Luigi Federico
Babbage, Charles, 1791-1871; Numerical analysis
It is with the independent formula (8.) that we have to do.
Therefore it must be remembered that the conditions for the value of
are now modified, and that is a perfectly arbitrary
whole number. This circumstance, combined with the fact (which we may
easily perceive) that whatever is, every term of (8.) after the
()th is = 0, and that the ()th term itself is always
enables us
to find the value (either numerical or algebraical) of any th
Number of Bernoulli , in terms of all the
preceding ones, if we but know the values of ,
... . We append to this Note
a Diagram and Table, containing the details of the computation for
, (, ,
being supposed given).
On attentively considering (8.), we shall likewise perceive that we
may derive from it the numerical value of every Number of Bernoulli
in succession, from the very beginning, ad infinitum, by the
following series of computations:—
1st Series.—Let , and calculate (8.) for this value of .
The result is .
2nd Series.—Let . Calculate (8.) for this value of
substituting the value of , just obtained. The result
is .
3rd Series.—Let . Calculate (8.) for this value of ,
substituting the values of , before
obtained. The result is . And so on, to any extent.
The diagram[30] represents the columns of the engine when just
[Pg 61]
prepared for computing , (in the case of );
while the table beneath them presents a complete simultaneous
view of all the successive changes which these columns then severally
pass through in order to perform the computation. (The reader is
referred to Note D, for explanations respecting the nature and notation
of such tables.)
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