History of Computers and Computing, Mechanical calculators, 19th century, Joseph Edmondson
- Joseph Edmondson was the inventor of a circular calculating machine which was manufactured in the 1880’s in Halifax, England by the company Blakey, Emmott & Co for some time.Edmondson based his design on the circular stepped-drums mechanism of the machine of Philipp Matthäus Hahn, though the construction of Edmondson’s is quite different.Edmondson’s calculating machine was favorably mentioned in the 1911 Encyclopaedia Britannica, almost thirty years after its introduction.
Joseph Edmondson’s circular calculating machine
In 1883 Joseph Edmondson from Halifax, England, received three Great Britain patents for a circular calculating machine, based on the stepped-drums mechanism (patents №GB188316, GB18830016 and GB188300016). The machine was manufactured for some time in Halifax, by the company Blakey, Emmott & Co, a producer of telephones, but it is unknown how many devices were manufactured. The machine was initially introduced in a lecture to the Physical Society of London in February, 1885, then in several other sources, like Macchine da Calcolare of Giuseppe Pastore, 1885.
Edmondson returned to the circular stepped-drums mechanism of the machine of Philipp Matthäus Hahn, although the construction of Edmondson is quite different.
The machine is a quite solid brass device, with dimensions 48 x 41 x 15 cm and weight some 20 kg (including the wooden case).
Eight number slides are placed radial on the outer fixed portion of the machine. The hinged slide of the straight type of machine (e.g. machine of Colmar) is replaced by a circular plate, carrying 20 figure discs, each of which—depending on its position relative to the number slides and driving handle, respectively—can serve either for recording the result in multiplication, or for setting the figures of the multiplier. Stepping is performed by lifting this plate, rotating it through one-twentieth of a revolution, and lowering it again. To multiply, the figures of the multiplier are set on the middle plate and those of the multiplicand on the slides. The driving handle is then turned to the right and the plate stepped clockwise until all the digits of the multiplier have been brought to zero. The product then appears in the apertures on the middle plate.
The machine is provided with a zero-setting mechanism with which some, or all of the windows may be set to zero.
Edmondson’s calculating machine attracted enough notice to be favorably mentioned in the 1911 Encyclopaedia Britannica, almost thirty years after its introduction.
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