Part of PICRYL.com. Not developed or endorsed by the Library of Congress

selected digitized books

modern lessons

roger logan melchior

chicago felt and tarrant manufacturing company

controlled key comptometer

reciprocals

walter hart

calculators

public

256 media by topic ∙ page 1 of 3

Clerks working a census tabulator

Clerks working a census tabulator

Photograph shows two clerks operating a tabulator head with feeding device; clerks watch stacks of cards showing positions before and after the tabulating operation.

[Calculating device for multiplication using circular disks]

[Calculating device for multiplication using circular disks]

Illus. in: The description and use of two arithmetick instruments. London : Printed by M. Pitt, 1673. Published in: The tradition of technology : Landmarks of Western technology ... / Leonard C. Bruno. Washing... More

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

The Bonus division where the many clerks figure the amount of the bonus each veteran is entitled to / National Phot.

The Bonus division where the many clerks figure the amount of the bonu...

Employees, primarily female, working at machines in the Computing Division of the Treasury(?) Department.

[Details of the mechanisms of the Leibniz calculator, the most advanced of its time]

[Details of the mechanisms of the Leibniz calculator, the most advance...

Picryl description: Public domain illustrated book page scan, engraving, free to use art, no copyright restrictions image.

[Calculating machine designed by Pascal] / Louvet sculpt. Rue Galande No. 51.

[Calculating machine designed by Pascal] / Louvet sculpt. Rue Galande ...

Picryl description: Public domain illustrated book page scan, engraving, free to use art, no copyright restrictions image.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

[Box with rotating rods and a matrix for doing mathematical calculations]

[Box with rotating rods and a matrix for doing mathematical calculatio...

Illus. in: Organum mathematicum .... Herbipoli : Sumptibus Johannis Andreae Endteri & Wolfgangi Jun. haeredum excudebat Jobus Hertz ... ; Prostant Norimbergae : Apud dictos Endteros, anno 1668. Published in: T... More

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Arithmetic without figuring

Arithmetic without figuring

Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Table of reciprocals for numbers from 1 to 10,000, to be used in connection with the controlled-key comptometer adding and calculating machine

Table of reciprocals for numbers from 1 to 10,000, to be used in conne...

Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

Modern lessons on calculating machines,

Modern lessons on calculating machines,

Text runs parallel with back of cover. Also available in digital form.

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