Marchant Model EB9 Calculating Machine

This full-keyboard, non-printing electric pinwheel calculating machine has nine columns of plastic keys, colored according to the place value of digits entered. At the base of each bank of keys is a red clearance key. The underlying keyboard is painted green. Between banks of keys are metal rods for decimal markers. To the right of the keyboard are bars for subtraction and addition; a red ADD key, depressed for automatic clearance after each operation; and a stem for a clear key (the key is missing). Still further to the right is a column of nine keys for automatic multiplication. Left of the keyboard is a switch for the motor.
Behind the keyboard is a movable carriage with 18 windows for the result register. Above this is a nine-digit entry register and a nine-digit revolution register. Clearance keys for these registers are to the right. At the back of the machine is the electric motor. The machine has an aluminum base and four rubber feet.
A mark on metal tags attached to the sides of the machine reads: MARCHANT. A sticker attached to the back reads: MANUFACTURED BY (/) MARCHANT CALCULATING MACHINE CO. (/) OAKLAND, CALIFORNIA U.S.A. (/) PATENTED IN UNITED STATES & FOREIGN COUNTRIES (/) UNITED STATES 1,476,197 DEC. 4, 1923 (/) AUSTRALIA 5,861 MARCH 2, 1922 (/) CANADA 239,984 MAY 13, 1924 (/) CHILE 4,884 OCT. 18, 1922 (/) GREAT BRITAIN 185,552 JUNE 14, 1921 (/) HOLLAND & COLONIES 11,299 APRIL 16, 1924 (/) JAPAN 40,871 NOV.30, 1921 (/) SOUTH AFRICA 78 JAN. 27, 1922 (/) OTHER UNITED STATES AND FOREIGN PATENTS (/) ISSUED AND PENDING. A metal tag attached to the motor reads: MANUFACTURED FOR (/) MARCHANT (/) CALCULATING (/) MACHINE CO. (/) SIMPLICITY (/) ACCURACY (/) SPEED. It also reads: WESTINGHOUSE ELEC. & MFG. CO. A mark on the bottom of the machine reads: EB9-9060.
The Marchant EB9 was introduced in 1926. The style of labels on the machines indicates that it was made before 1933. It sold for $550 in 1930 and was superseded that year by the EE.
Compare 1984.3084.88.
Currently not on view
Object Name
calculating machine
date made
ca 1930
Marchant Calculating Machine Co.
Physical Description
metal (overall material)
plastic (overall material)
rubber (overall material)
overall: 19 cm x 30.5 cm x 44 cm; 7 15/32 in x 12 in x 17 5/16 in
place made
United States: California, Oakland
ID Number
catalog number
accession number
maker number
Science & Mathematics
Calculating Machines
See more items in
Medicine and Science: Mathematics
Calculating Machines
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Burton J. Udelson
Additional Media

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