## Origin of Modern Calculating Machines: A Chronicle of the Evolution of the Principles that Form the Generic Make Up of the Modern Calculating Machine |

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adding machine adding mechanism adding the multiple applied arranged Barbour Bollee Bouchet Burroughs patent Burroughs recorder carriage carrying lever carrying mechanism cash register chine ciphers co-acting combination construction crank denominational actuators detent drum engage error feature Felt patent Felt recorder Felt's figures gear racks Gottfried Wilhelm Leibnitz higher wheel Hill machine ink-ribbon invention inventors key action key depression key Locked key-action key-driven calculating machine key-driven machine key-set key-stroke keyboard lever G locked lower wheel manipulation marked marked E motion multiple-order key-driven Napier's Bones nine-tooth gear normal numeral wheels old Comptometer operator paper patent drawings patent issued pinion pivoted platen Pottin prime actuation printing ratchet device ratchet pawl recording machine recording-adder recording-adding machine Robjohn rotation scheme shaft shown in Fig spring stop Swalm teeth tens tion tiples tooth transfer device trigger latches type sector type-wheels typewriter U. S. Patent Office units wheel

### Popular passages

Page 55 - I have always called it the macaroni box model. For keys I procured some meat skewers from the butcher around the corner and some staples from a hardware store for the key guides and an assortment of elastic bands to be used for springs. When Thanksgiving day came I got up early and went to work with a few tools, principally a jackknife. I soon discovered that there were some parts which would require better tools than I had at hand...

Page 179 - The use of the slips for the purpose of multiplication is now evident ; thus, to multiply 2085 by 736 we take out in this manner the multiples corresponding to 6, 3, 7 and set down the digits as they are obtained, from right to left, shifting them back one place and adding up the columns as in ordinary multiplication, viz., the figures as written down are 12510 6255 14595 1534560 Napier's rods or bones consist of ten oblong pieces of wood or other material with square ends.

Page 179 - may be easily explained by imagining ten rectangular slips of cardboard, each divided into nine squares. In the top squares of the slips the ten digits are written, and each slip contains in its nine squares the first nine multiples of the digit which appears in the top square. With the exception of the top square, every square is divided into parts by a diagonal, the units being written on one side and the tens on the other, so that when a multiple consists of two figures they are separated by...

Page 55 - I went to the grocer's and selected a box which seemed to be about the right size for the casing. It was a macaroni box, so I have always called it the macaroni box model. For keys, I procured some meat skewers from the butcher around the corner and some staples from a hardware store for the key guides, and an assortment of elastic bands to be used for springs.

Page 179 - ... 3, 8, 6, the seventh of 1, 4, 8, 5, the eighth of 2, 3, 7, 6, the ninth of 2, 4, 7, 5, and the tenth of 3, 4, 6, 5. Each rod, therefore, contains on two of its faces multiples of digits which are complementary to those on the other two faces ; and the multiples of a digit and its complement are reversed in position.

Page 56 - I had expected to construct in a day was a long way to be complete or in working order. I finally had some of the parts made out of metal and finished the model soon after New Year's Day 1885.

Page 179 - ... 1, 9, 8, the second of o, 2, 9, 7, the third of o, 3, 9, 6, the fourth of o, 4, 9, 5, the fifth of 1, 2, 8, 7, the sixth of 1, 3, 8, 6, the seventh of 1, 4, 8, 5, the eighth of 2, 3, 7, 6, the ninth of 2, 4, 7, 5, and the tenth of 3, 4, 6, 5. Each rod, therefore, contains...

Page 179 - Napier's rods or bones consist of ten oblong pieces of wood or other material with square ends. Each of the four faces of each rod contains multiples of one of the nine digits, and is similar to one of the...

Page 179 - ... 8, 6, the seventh of I, 4, 8, 5, the eighth of 2, 3, 7, 6, the ninth of 2, 4, 7, 5, and the tenth of 3, 4, 6, 5. Each rod therefore contains on two of its faces multiples of digits which are complementary to those on the other two faces; and the multiples of a digit and of its complement are reversed in position. The arrangement of the numbers on the rods will be evident from fig.

Page 55 - I knew that many accountants could mentally add four columns of figures at a time," Dorr Felt says, "so I decided that I must beat that in designing my machine.