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BLEEKER

Caroline Emilie Bleeker (1897-1985)

Bleeker studied mathematics at the University of Utrecht in the Netherlands. At that time, higher education was rare for women. In 1928 she received her PhD in physics under the supervision of Leonard Ornstein, Professor of Experimental Physics. In 1930, Bleeker began a successful physics consultancy company in Utrecht. As well as giving advice, she also produced scientific and optical equipment. In 1937, she expanded the company by adding an optical division (probably in association with Frits Zernike (1888-1966). Initially, the factory produced binoculars. During World War II, few binoculars were produced.
In 1949, Bleeker moved from Utrecht to a more spacious building in Zeist. The company expanded, bolstered by the production of the phase contrast microscopes invented by Frits Zernike. This milestone in microbiology won him the Nobel prize for Physics in 1953 (extensively reported in the personnel magazine De Loupe).
The production of cheaper, lower quality microscopes by other companies caused financial difficulties for the Bleeker factory, and in 1963 Bleeker resigned as CEO. In 1978, Nedoptifa was taken over by Oldelft.

Caroline Bleeker is one of the important women of Dutch history whose life is described in the book ‘1001 Women in the 20th century‘ and was part of the exhibition in the Amsterdam Museum from 3 October 2018 to 10 March 2019. Caroline Bleeker’s biography is also included in the Digital Women’s Lexicon of the Netherlands (DVN), an online collection of biographies of the most remarkable women of the history of the Netherlands.

BLEEKER microscopes

Compound achromatic microscope, stand S

BLEEKER

1939-1948

Compound achromatic microscope, stand S

BLEEKER

1950-1960

Compound achromatic microscope, stand S, opened

BLEEKER

1950-1960

Compound achromatic microscope

BLEEKER

1950-1960

Compound achromatic microscope, type S, phase contrast

BLEEKER

1950-1960

Compound achromatic microscope, type S, binocular tube

BLEEKER

1950-1960

Inspection microscope

BECK KASSEL CBS

1950-1970

Compound achromatic microscope, stand S, with binocular tube

BLEEKER

1950-1960

Compound achromatic microscope, stand S, phase contrast

BLEEKER

1950-1960

Compound achromatic microscope on box

BLEEKER

1950-1960

Compound achromatic pseudoscopic microscope

BLEEKER

1955-1960

Compound achromatic pseudoscopic microscope

BLEEKER

1955-1960

Compound achromatic microscope, stand K

BLEEKER

ca. 1960

Compound achromatic microscope, stand M

BLEEKER

1962-1965

Compound achromatic microscope, stand R

BLEEKER

1960-1970

Compound achromatic microscope, stand R

BLEEKER

1960-1970

Compound achromatic microscope, stand K

BLEEKER

ca. 1960

Compound achromatic microscope, stand M

BLEEKER

1962-1965

Reversed microscope, type W, binocular tube

BLEEKER

ca. 1962

Compound achromatic workshop microscope

BLEEKER

ca. 1962

BLEEKER accessories microscopy

Microscope lamp

BLEEKER

1950-1960

Lenses and prisms

BLEEKER

ca. 1950

Dark field condenser

BLEEKER

1950-1970

Bright field condenser

BLEEKER

1950-1970

Astro eyepieces

BLEEKER

1950-1960

Objective lenses, type A

BLEEKER

1950-1960

Micrometer eyepiece

BLEEKER

ca. 1950

Dark field condenser

BLEEKER

1950-1970

Microscope lamp

BLEEKER

1950-1960

Microscope lamp

BLEEKER

ca. 1950

Tube

BLEEKER

1950-1960

Drawing prism

BLEEKER

1955-1965

Drawing prisms

BLEEKER

1955-1965

Microscope tube with revolver and vertical illuminator

BLEEKER

1960

Screw micrometer eyepiece

BLEEKER

1960-1962

Microscope lamp

BLEEKER

ca. 1960

Microscope lamp

BLEEKER

ca. 1960

Microscope lamp

BLEEKER

ca. 1960

Binocular tube for stand R

BLEEKER

1960-1970

Microscope tube with revolver and vertical illuminator

BLEEKER

1960

BLEEKER other optical equipment

Achromatic magnifier 8×

BLEEKER

1940-1955

Cytometer

BLEEKER

1940-1960

Folding hand magnifier

BLEEKER

1940-2017

Achromatic magnifier 12× and 10×

BLEEKER

1940-1947

Achromatic magnifier 12×

BLEEKER

1940-1950

Spectroscope

BLEEKER

1946-1950

Universal refractometer after Abbe

BLEEKER

1950-1955

Refractometer/saccharimeter

BLEEKER

1950-1960

Achromatic magnifier 10×

BLEEKER

1950-1960

Universal refractometer after Abbe

BLEEKER

1950-1960

Porro prism binocular 6×24

BLEEKER

ca. 1950

Porro prism binocular 6×30

BLEEKER

ca. 1950

Porro prism binocular 6×24

BLEEKER

ca. 1950

Refractometer or Saccharimeter opened

BLEEKER

1950-1960

Universal refractometer after Abbe

BLEEKER

1950-1960

Viewer cathetometer

BLEEKER

1950-1960

Porro prism binocular 6×30

BLEEKER

ca. 1950

Universal refractometer after Abbe

BLEEKER

1950-1960

Refractometers/saccharimeters

BLEEKER

1945-1965

Porro prism binocular 7×50

BLEEKER

ca. 1953

Thread counter

BLEEKER

1955-1965

Thread counter

BLEEKER

1955-1965

Spectroscope

BLEEKER

ca. 1960

BLEEKER electrical measuring equipment

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

Transformer

BLEEKER

ca. 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