Rare Stereo Image of Grant Difference Engine
  • Rare Stereo Image of Grant Difference Engine
  • Rare Stereo Image of Grant Difference Engine
  • Rare Stereo Image of Grant Difference Engine
  • Rare Stereo Image of Grant Difference Engine

Rare Stereo Image of Grant Difference Engine

£180

Dimensions

7 inches x 4.25 inches

Circa

1876

Category: Calculating

Description

“Calculating Machine exhibited by George B. Grant, Waverley House, Boston, Mass at the U. S. Centennial exhibition 1876. The Difference Engine was invented in 1870, while the inventor was at Harvard College. All attempts to raise the means for building it failed, till the summer of 1874, when, through the persistent efforts of Prof. Walcott Gibbs, the construction of the machine now exhibited was ensured.

It is designed for the construction of large mathematical tables of all kinds. It stands five foot in height, by eight in length; weighs some 2000lbs; consists of upwards of 15,000 pieces and is worth about 10,000 dollars.

It computes and prints any table, at the rate of about forty terms a minute, and prepares a mould of its work in wax, from which an electrotype is taken, ready for the press.”

Description on rear of card.Sepia Images, left hand slightly faded small amount of spotting, two little nicks at edge of left image which has lifted slightly

7 inches x 4.25 inches

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GB Fletcher

Fletcher Wallis

Fletcher Wallis sells objects and books relating to the history of science, medicine and technology from his unit at Admiral Vernon Arcade Portobello Road. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for thirty five years.

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