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5th August
On this day in
1900
, the engineer
Frank Baldwin
was awarded a U.S. Patent for his mechanical calculator. This machine was capable of doing a calculation such as
54679285
×
3298
=
180332281930
54679285 \times 3298 = 180332281930
5
4
6
7
9
2
8
5
×
3
2
9
8
=
1
8
0
3
3
2
2
8
1
9
3
0
in about
20
seconds with eight turns of the handle.