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Electrical measuring equipment

The Historical Microscopy Foundation has a considerable collection of very accurate Bleeker electrical equipment. This equipment was developed and produced in the Bleeker factories from the beginning of the last century until the seventies. This took place at the time when the production of analogue electrical devices went through an explosive development and there was a great need for highly accurate electrical measuring and control equipment.

The foundation presents on this site her collection, organised in three types of equipment:

  • Measuring equipment, as resistance measuring bridges (Wheatstone and Thomson), microvolt meters, galvanometers and compensators (Diesselhorst).
  • Control equipment as variable resistance boxes, potentiometers, slide resistors and variable power supplies.
  • Calibration elements, as normal elements en normal resistors.

We often get questions about the importance of these devices. In the the underlying text, dr. Ad Labrujere explains why this equipment is so important in the development of electronics.

We briefly discuss the operation of the equipment. A description per collection item has been added, sometimes combined with a measurement report. There are also many original documents with product specifications available (most of them in Dutch).

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Precision resistors, series 24000

BLEEKER

1930-1970

Transformer

BLEEKER

1935-1945

Two-decade resistance box, ebonite

BLEEKER

1939-1949

Mirror galvanometers

BLEEKER

1940-1960

Compensator, type 2165

BLEEKER

1948

Five-decade resistance box

BLEEKER

1949

Three-decade resistance box

BLEEKER

1950-1978

Compensator, type 2169

BLEEKER

1950-1960

Compensator, type 2169

BLEEKER

1950-1960

Compensator, type 2169

BLEEKER

1950-1960

Wheatstone bridge, type 51201

BLEEKER

1950-1960

Six-decade resistance box

BLEEKER

1950-1960

Four-decade resistance box, type 31480

BLEEKER

1950-1960

Two-decade resistance box

BLEEKER

1950-1960

Electric discharge instrument

BLEEKER

1950-1960

Thomson bridge, type 2183

BLEEKER

1950-1960

Diesselhorst compensator, in plexiglass

BLEEKER

1950-1960

Power control box for Diesselhorst compensator, in plexiglass

BLEEKER

1950-1960

Auxiliary box for Diesselhorst compensator, in plexiglass

BLEEKER

1950-1960

Wheatstone bridge, type 2160 LD

BLEEKER

1950-1960

Compensator

BLEEKER

1950-1960

Wheatstone bridge

BLEEKER

1950-1960

Resistor switch

BLEEKER

1950-1960

Resistor switch

BLEEKER

1950-1960

Teclu burner

BLEEKER

ca. 1950

Normal resistors

BLEEKER

1950-1960

Auxiliary box for Diesselhorst compensator

BLEEKER

1955-1965

Thomson bridge, type 52431

BLEEKER

1955-1965

Auxiliary box for Diesselhorst compensator

BLEEKER

1955-1965

Compensator

BLEEKER

1955

One-decade resistance box

BLEEKER

1956

Normal resistors

BLEEKER

1950-1975

Normal resistors

HUYSER

1953-1980

Two-decade resistance box

HUYSER

1979