Marchant Model ERBF6 Calculating Machine

This full-keyboard, non-printing electric pinwheel calculating machine has six columns of color-coded plastic keys. The rightmost column contains seven red keys marked from 1/8 to 7/8. The two columns left of this have black keys, and the three leftmost columns have white keys. Pushing a fraction key enters the appropriate three-digit decimal equivalent. At the base of each bank of keys is a red clearance key. The underlying keyboard is painted green. The macine has no rods between columns of keys for decimal markers.

Right of the number keys is a red clear key and a red “ADD” key. When the add key is depressed, the keyboard may clear after each operation. Above the clear key are subtraction and addition bars. Left of the number keys is the switch for turning on the motor. The back of the case can be removed to expose the registers.

In back of the keyboard is a movable carriage with 12 windows in the result register. Behind this are six windows for showing digits entered and six windows for the revolution register. Decimal markers are above each register. The two black keys next to the carriage may clear the result and revolution register. At the back of the machine is a place for a motor but no motor. The machine has a black plastic cover.

Marks on metal plates on the right and left sides of the machine and on the cover read: MARCHANT. A metal tag attached to the bottom of the machine has the serial number: ERBF6-1025.

The style of the MARCHANT label on the side of the machine indicates that it dates before 1933. The model ERB was introduced in about 1926. The fractional model was furnished in all models and sizes on special order. The model ERBF6 sold in 1930 and 1931 for about $400.

References:

Marchant, “”Marchant Electric Models,” (1979.3084.88)

Currently not on view