Collection search - Examination Unit [textual record]

Record information – Brief
1
Examination Unit [textual record]

Hierarchical level:

Series

Date:

1939-1946.

Reference:

R112-278-3-E, RG24-C-22

Type of material:

Textual material

Found in:

Archives / Collections and Fonds

Item ID number:

134683

Context of this record:

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Department of National Defence fonds

Examination Unit
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Record information – Details
Series includes:

95 lower level description(s)
View lower level description(s)

Date(s):

1939-1946.

Bilingual equivalent:

Click here

Place of creation:

Canada

Extent:

2.6 m of textual records
5 microfilm reels 16 mm film

Language of material:

English

Scope and content:

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Series consists of documents related to the administration and operations of the Examination Unit (EU) and the Joint Discrimination Unit (JDU), the organizations responsible for anaylzing and deciphering enemy signals during the Second World War.

The records in RG 24 Volume 29163 to Volume 29168 deal with various aspects of the work of these units and their cooperation and liaison with signals intelligence (SIGINT) units in the Canadian Armed Forces and their American and British counterparts. In addition, there is a formerly classified official history of the Examination Unit, written by staff members.

The records in RG 24 Volume 29168 to Volume 29173 are decrypts of intercepted diplomatic signals from the Germans and the Japanese. The intercepted signals mostly originated with German and Japanese diplomats located in neutral South and Central American countries.

The records in RG 24 Volume 20306 to Volume 20307 are also decryps of intercepted diplomatic signals from the Germans and Japanese diplomatic service.

The records found on microfilm reels RG 24 T-17425 to T-17427 are decrypts of intercepted diplomatic signals originating with the diplomatic service of the Free French. The records found on microfilm reels RG 24 T-17427 to T-17429 are decrypts of intercepted Vichy French diplomatic traffic.
Additional name(s):

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Canada. Dept. of National Defence. Examination Unit

Canada. National Research Council. Examination Unit
Biography/Administrative history:

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Canada. Dept. of National Defence. Examination Unit : The Examination Unit was established by External Affairs under the auspices of the National Research Council in June 1941 to undertake cryptanalysis, or codebreaking, operations. The Unit worked closely with other Allied intelligence organizations, especially British Security Co-ordination in New York City. The Unit's main responsibility was decoding intercepted wireless traffic between Germany and enemy agents located in neutral countries, particularly in South America, and between Japan and Japanese consulates in the United States. The Unit was disbanded at the end of the war. In September 1946, the responsibility for signals intelligence was transferred to the Communications Branch of the National Research Council. RG 24 General Inventory

Finding aid:

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Textual records (Electronic) Finding aid 24-171 is a file list relating to RG24-C-22, volumes 20306-20307, 29163-29173. The finding aid also covers microfilm reels T-17425 to T-17429. The finding aid identifies the reel number, the origin of the signal, the message number and the date. The finding aid can be found by accessing the lower level descriptions attached to this record. 24-171 (90: Open)

(Electronic) Finding aid 24-171 is available as a PDF attached to this record, T-17425-T-17429. 24-171 PDF (90: Open)
http://data2.archives.ca/pdf/pdf002/24-171_134683_T-17425-T-17429_open.pdf

Additional information:

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Source of title:

Title is based on the contents of the series.

Custodial history:

The records found in RG 24 Volume 20306 to RG 24 Volume 20307, and RG 24 Volume 29168 to RG 24 Volume 29171 are photocopies of reader-printer copies produced by CSE. CSE was not able to locate the source microfilm from which these records were produced.

Container note(s):

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T-17425 : Copy No. 1
T-17426 : Copy No. 1
T-17427 : Copy No. 1
T-17428 : Copy No. 1
T-17429 : Copy No. 1
T-17425 : Copy No. 2
T-17425 : Copy No. 3
T-17425 : Copy No. 4
T-17426 : Copy No. 2
T-17426 : Copy No. 3
T-17426 : Copy No. 4
T-17427 : Copy No. 2
T-17427 : Copy No. 3
T-17427 : Copy No. 4
T-17428 : Copy No. 2
T-17428 : Copy No. 3
T-17428 : Copy No. 4
T-17429 : Copy No. 2
T-17429 : Copy No. 3
T-17429 : Copy No. 4

Source:

Government

Related control no.:

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116-000034-8
1987-88/246 GAD
1988-89/034 GAD
2000-00871-2
RG24-C-22

Former archival reference no.:

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RG24-C-22
Ordering and viewing options

Conditions of access:

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Textual records

[Consultation90 Open]

Volume [RG24]

[Consultation 90 Open]

20306--20307;

[Consultation 90 Open]

29163--29173;

[Consultation 90 Open]

Textual records: microform

[Consultation90 Open]

Microfilm reel [RG24] T-17425--T-17429

[Consultation 90 Open]

Terms of use:

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Date modified:: 2024-07-24