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in subjects: "calculators"  
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Tax-Calculating Device

Description: Patent for a tax calculating device that will calculate the percentages of the total tax that need to go to different agencies.
Date: April 23, 1912
Creator: Goss, George W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Time-Calculator.

Description: Patent for a machine that easily calculates the number of days within a given time span, up to one year, with illustrations.
Date: October 18, 1886
Creator: Wood, William
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Calculating Device.

Description: Patent for a new and improved calculator. This design "consists in having a central disk provided on each side with a disk somewhat smaller, the three being pivoted centrally, so that the smaller disks on the sides may be rotated independently of the central disk. The central disk has twelve or more marginal figures on each side, equidistant from each other, and a column of figures extending inwardly from each marginal figure" (lines 19-27).
Date: November 24, 1885
Creator: Tucker, Argyle W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Calculating-Machine.

Description: Patent for an improvement to mechanical calculators by providing the "means for facilitating the addition of successive numbers of the same or different denominations, and also for subtracting and multiplying the same by substantially the means employed in adding" (lines 10-14). It includes a written explanation and illustrations.
Date: April 17, 1894
Creator: Stallard, Sherman R.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Calculator.

Description: Patent for a calculator "in which a bar having a series of numbers thereon slides in a frame or base also provided with a series of numbers" (lines 10-12). It is meant for quickly adding numbers.
Date: October 13, 1896
Creator: Copeland, Wesley Albert & Roberts, Cyrus
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Calculator

Description: Patent for a calculator which consists of semicircular device with movable pointers and number indexes printed on it that allows the pointers to be moved to different numbers to produce the answer to a math problem such as calculating the cost of goods sold by the pound in a store.
Date: December 21, 1909
Creator: Goss, George Wilson
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Partner: UNT Libraries Government Documents Department

Cash-Register.

Description: Patent for a simple and inexpensive cash-register that is accurate and alerts the customer to the price. The operator must charge the correct amount for the purchase.
Date: September 25, 1894
Creator: Johnson, William W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Adding Machine.

Description: Patent for a new and improved adding machine. This design "consists in the combination, with a box, of a spindle in the same, a sleeve surrounding the spindle, a hand on the spindle, a hand on the sleeve, devices for turning the spindle from the sleeve, a cog-wheel revolving from the spindle, and an extra hand in connection with the cog-wheel" (lines 10-16).
Date: September 22, 1885
Creator: McCaleb, John L.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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