Accession No
6793
Brief Description
comparator bridges for microscopes, used by Harry Godwin, by Ernst Leitz, German, mid-20th Century
Origin
Germany; Wetzlar
Maker
Ernst Leitz
Class
microscopes
Earliest Date
1900
Latest Date
1986
Inscription Date
Material
metal; glass; plastic
Dimensions
6793.1: width 513mm; depth 75mm; height 87mm 6793.2: width 513mm; depth 94mm; height 109mm
Special Collection
Cambridge Quaternary Research Collection
Provenance
Donated by the Department of Geography, University of Cambridge. Used by Sir Harry Godwin, founder and first director of the Subdepartment of Quaternary Research (SDQR)
Inscription
'ERNST LEITZ WETZLAR
GERMANY' [plaque on front] [both]
'C.U.BOT.SCH.O.R.' [on front (6793.1)] [on rear (6793.2)]
Description Notes
Two comparator bridges, for microscopes, by Leitz Wetzlar, German, mid-20th Century.
A pair of visually similar objects with opposite functions: one bridge (6793.1) allows one user to view two specimens simultaneously; the other allows two users to view the same specimen simultaneously. Both were used with microscopes Wh.6786 and Wh.6788 (not included).
Both objects have a grey metallic finish, with black plaques on the front. 6793.2 also has a plaque on the back, which was likely added by the department and not by the manufacturer.
6793.1 has two connectors on the bottom, where it would be affixed to the eyepiece mount of two microscopes; and one connector on the top, where the eyepiece would be mounted. The latter connector features a lever to release the eyepiece. There is a knurled knob at each end on the top. Each rotates up to 90 degrees and clicks into place to allow the user to choose which specimen to view and by what degree. There is also a knob on the back.
6793.2 is the inverse: it has one connector on the bottom, and two on top. Each of the top mounts has a lever to release the eyepiece. There is a small lever on the front, in the centre, which is topped with a black plastic sphere. This moves from side to side smoothly and can be extended.
References
Events
Description
A large part of Godwin’s work involved comparing his collected pollen specimens with samples held in the archive to try and identify the species that it came from. To do this, he used these two microscopes [Wh.6786 and Wh.6788]
The device bridging the two [Wh.6793.1] allows a single viewer to look at two specimens simultaneously and compare them easily.
Another model of bridge [Wh.6793.2] would allow two viewers to both look at the same specimen, which was very useful for teaching.
Harry Godwin
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Sir Harry Godwin was a botanist and ecologist who founded the Subdepartment of Quaternary Research (SDQR) within the Department of Geography. As a child, he was a dedicated boy scout, which possibly helped develop his taste for outdoor work. He was interested in a wide range of subjects starting from the time he was at school, and never let his curiosity go unsatisfied. At Clare College, he studied botany, geology, and chemistry, and was encouraged by his supervisor to study fungi and plant diseases, too. After he had graduated and began his own research, he was torn between plant physiology and ecology. He picked both.
Godwin worked to combine botany with ecology, studying plants in the field rather than under laboratory conditions.
In addition to founding the SDQR in 1948, he served as its director until 1966, and he was also the Professor of Botany at Clare College between 1960 and 1968. Even after he retired from academia, he wasn’t idle. He threw himself back into his field work and research, and published several books which are considered foundational to the subject of Quaternary research.
Quaternary Research
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The Quaternary Period is the period from about 2.58 million years ago up to the present. Quaternary Research, then, is the study of this period: it’s the study of the rocks, plants and animals found in this time period, and how they have changed over time. The Quaternary period is also known as the Ice Age due to the presence of permanent ice sheets at the poles, and it is characterised by alternating glaciations and interglacial periods.
Because the goal of the subject is to understand everything about the period, Quaternary Research requires contributions from scientists in many different fields: from zoologists and botanists to geologists and physicists, and more besides. Quaternary research is particularly focussed on the environment and ecosystems, and changes in the climate. The field is especially important for understanding the impact that humans are having on the environment. It’s also important for archaeology, providing a reference point when studying human activity.
The objects in this case represent the various stages of research, from field work, to cataloguing, to intensive laboratory study, but this is only a small part of what Quaternary Research is all about.
18/05/2023
Created by: Ewan Wilson on 18/05/2023
FM:47619
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