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4-Decade Voltage Dividing Resistance Box

Technical Information

Catalogue No: C0656
Category: General Purpose
Object Type: Test Equipment
Object Name: 4-Decade Voltage Dividing Resistance Box
Part No: D-801-D
Serial No: 461866
Manufacturer: Muirhead & Co
Division: Unknown
Year of Manufacture: circa 1951
Dimensions: Width (mm): 365
Height (mm): 130
Depth (mm): 105
Weight (g): 2,510
Location: Rack RAA07 [Main Store]

Muirhead & Co. Ltd.
No. 461866
Voltage Dividing Resistance Box
Maximum Input 250V. R.M.S.


An accurate switched potentiometer that can be used to divide a fixed standard reference voltage by a set amount for test stimulation or measurement purposes. Divider chain resistance: 10,000ohms.

The unit also bears an Elliott Brothers (London) Ltd label marked "I.N. 791" and a Dymo label "T6772".
The instrument operates as a potential divider of the Rayleigh type in which the total resistance presented to the input is kept constant, the switches being so designed that as resistance is added to one side of the dividing point, an equal resistance is removed from the other side.
The instrument can also be used as a decade resistance box.

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