Ask the Scholar
Page 42 of 71
I can add historical knowledge about this page.
Page image
OCR
SECRET
The trochotron has been extensively tested in Great Britain and it appears that
it can be used as a scalar (scale-of-anything). Its reliability is greatly increased and
satisfactory operation as a scalar is obtained if it is preceded by a normal scale-of-two
circuit. Its only advantage over scalars of a more conventional type is some simpli-
fication of the circuit, against which must be balanced the considerable complexity of
the trochotron itself. The minimum resolution time probably achievable is one micro-
second. This applies to the scale-of-ten used as described above, i.e., as a scale-of-five
preceded by a normal scale-of-two.
In television research Sweden has been almost inactive in the past. However, a
Swedish Television Committee, under the chairmanship of E. B. Esping and with repre-
sentatives from the Technical Research Council, Royal Institute of Technology, Re-
search Institute of National Defense, and L. M. Ericsson Company has recently been
formed. It will be five years before public television is available in Sweden. The next
two years will be devoted to research and study in order to catch up with the rest of
the world in techniques. Space and instruments were donated by KTH and the
expenses guaranteed by private donations. The immediate emphasis will be on the
use of television for military purposes.
a. Radar
It seems clear that in the past little or no attention has been paid to the
development of Swedish radar, with the possible exception of acquisition and conversion
of obsolete German sets. At the end of World War II, Sweden lost no time in attempt-
ing to buy British (AA MK VII, among others) and US equipment. British willingness
to deliver may be conditioned by attempts to push Sweden off dead-center neutrality.
The Air Force possesses no AI equipment but is trying to buy GCI sets from Canada.
The first radar in Sweden was purchased from the US and was installed by the Meteor-
ology and Hydrographic Institute on the roof of its building at Fridhemsplan, Stock-
holm, to aid in weather forecasting. A Swedish radar set was reported to have been
installed on the Malmo-Copenhagen train ferry in 1946. It was unsatisfactory in
operation and was replaced by a Cossor Ltd. set. In early 1948 the Swedish State Rail-
way bought a Raytheon set for another ferry on this run. The Swedish-American Line
has installed Raytheon sets on the Tunsholm, the Gripsholm, and the Drottningholm.
The new Stockholm will have an RCA set. Westinghouse radar is also used in Sweden.
In the past two years, the Swedish-American Line has acquired 37 radar installations.
The Swedish icebreaker Ymer used radar with great success in the winter of 1947-48 in
navigation in the Gulf of Bothnia. It is known that the Swedish Navy has a very keen
interest in radar and strongly supports research at the Research Institute of National
Defense.
Research in radar at the Research Institute of National Defense comes under
the Teletechnical Section. Martin Fehrm heads the section, and Colonel Gustaf Cra-
foord, who recently acquired considerable technical information in the U.S., is responsi-
ble for the radar program. Colonel Torsten Schmidt is in charge of all defense research
in Sweden. This laboratory is reported to be working on microwave (1/2 to 2 cm)
EO 12958
research.
3.3 (b)(1)
Research on microwaves
is also being strongly supported at the Division of Radio Engineering, KTH, which has
had experience in the high-frequency field.
EO 12958
(b)(1)
35
SECRET
Page data
- Page
- 42
- Source index
- 0
- Type
- photo
- Media ID
- b82b718fd0dc805d
- Size
- unknown
Document data
- ID
- 486498019
- Core
- doc
- Type
- document
DTO data
{
"id": "486498019",
"sourceUrl": "https://catalog.archives.gov/id/486498019",
"contentType": "document",
"title": "Report, OSI - 1/49, Central Intelligence Agency, An Estimate of Swedish Capabilities in Science",
"citationUrl": "https://catalog.archives.gov/id/486498019",
"collections": [
"President's Secretary's Files (Truman Administration)",
"Intelligence Files"
],
"iiifBase": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-01-001.tif",
"thumbnailUrl": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-01-001.tif",
"largeImageUrl": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-01-001.tif",
"imageCount": 71,
"hasImages": true,
"source": "import",
"hasTranscription": false
}
Context sent to Scholar
Document identity
{
"localId": "486498019",
"label": "Report, OSI - 1/49, Central Intelligence Agency, An Estimate of Swedish Capabilities in Science",
"core": "doc",
"dtoType": "document",
"citationUrl": "https://catalog.archives.gov/id/486498019"
}
Document source metadata
{
"id": "486498019",
"sourceUrl": "https://catalog.archives.gov/id/486498019",
"contentType": "document",
"title": "Report, OSI - 1/49, Central Intelligence Agency, An Estimate of Swedish Capabilities in Science",
"citationUrl": "https://catalog.archives.gov/id/486498019",
"collections": [
"President's Secretary's Files (Truman Administration)",
"Intelligence Files"
],
"iiifBase": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-01-001.tif",
"thumbnailUrl": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-01-001.tif",
"largeImageUrl": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-01-001.tif",
"imageCount": 71,
"hasImages": true,
"source": "import",
"hasTranscription": false
}
Document source extras
{
"url": "https://catalog.archives.gov/id/486498019",
"naId": 486498019,
"levelOfDescription": "item",
"productionDates": [
{
"day": 9,
"logicalDate": "1949-08-09",
"month": 8,
"year": 1949
}
],
"recordType": "description",
"ocrSource": "nara-archive"
}
Page context
{
"seq": 42,
"pageIndex": 0,
"type": "photo",
"url": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-01-042.tif",
"mediaId": "b82b718fd0dc805d",
"ocrText": "SECRET\nThe trochotron has been extensively tested in Great Britain and it appears that\nit can be used as a scalar (scale-of-anything). Its reliability is greatly increased and\nsatisfactory operation as a scalar is obtained if it is preceded by a normal scale-of-two\ncircuit. Its only advantage over scalars of a more conventional type is some simpli-\nfication of the circuit, against which must be balanced the considerable complexity of\nthe trochotron itself. The minimum resolution time probably achievable is one micro-\nsecond. This applies to the scale-of-ten used as described above, i.e., as a scale-of-five\npreceded by a normal scale-of-two.\nIn television research Sweden has been almost inactive in the past. However, a\nSwedish Television Committee, under the chairmanship of E. B. Esping and with repre-\nsentatives from the Technical Research Council, Royal Institute of Technology, Re-\nsearch Institute of National Defense, and L. M. Ericsson Company has recently been\nformed. It will be five years before public television is available in Sweden. The next\ntwo years will be devoted to research and study in order to catch up with the rest of\nthe world in techniques. Space and instruments were donated by KTH and the\nexpenses guaranteed by private donations. The immediate emphasis will be on the\nuse of television for military purposes.\na. Radar\nIt seems clear that in the past little or no attention has been paid to the\ndevelopment of Swedish radar, with the possible exception of acquisition and conversion\nof obsolete German sets. At the end of World War II, Sweden lost no time in attempt-\ning to buy British (AA MK VII, among others) and US equipment. British willingness\nto deliver may be conditioned by attempts to push Sweden off dead-center neutrality.\nThe Air Force possesses no AI equipment but is trying to buy GCI sets from Canada.\nThe first radar in Sweden was purchased from the US and was installed by the Meteor-\nology and Hydrographic Institute on the roof of its building at Fridhemsplan, Stock-\nholm, to aid in weather forecasting. A Swedish radar set was reported to have been\ninstalled on the Malmo-Copenhagen train ferry in 1946. It was unsatisfactory in\noperation and was replaced by a Cossor Ltd. set. In early 1948 the Swedish State Rail-\nway bought a Raytheon set for another ferry on this run. The Swedish-American Line\nhas installed Raytheon sets on the Tunsholm, the Gripsholm, and the Drottningholm.\nThe new Stockholm will have an RCA set. Westinghouse radar is also used in Sweden.\nIn the past two years, the Swedish-American Line has acquired 37 radar installations.\nThe Swedish icebreaker Ymer used radar with great success in the winter of 1947-48 in\nnavigation in the Gulf of Bothnia. It is known that the Swedish Navy has a very keen\ninterest in radar and strongly supports research at the Research Institute of National\nDefense.\nResearch in radar at the Research Institute of National Defense comes under\nthe Teletechnical Section. Martin Fehrm heads the section, and Colonel Gustaf Cra-\nfoord, who recently acquired considerable technical information in the U.S., is responsi-\nble for the radar program. Colonel Torsten Schmidt is in charge of all defense research\nin Sweden. This laboratory is reported to be working on microwave (1/2 to 2 cm)\nEO 12958\nresearch.\n3.3 (b)(1)\nResearch on microwaves\nis also being strongly supported at the Division of Radio Engineering, KTH, which has\nhad experience in the high-frequency field.\nEO 12958\n(b)(1)\n35\nSECRET"
}