Ask the Scholar
Page 2 of 3
I can add historical knowledge about this page.
Page image
OCR
2.
Temperature control is also important, and for accurate work
suggest the use of pyrometers. The temperature range between 1000 and
1100 should be studied.
It is obvious that the material should not be crushed after the
final roasting, but when it is immersed in water it should break up into
very fine powder automatically. Probably 80 to 903 of our material
passes a 200 mesh bolting silk without any crushing.
It ocours to me that the use of liquid hydrogen sulphide might be
objectionable from the standpoint of removing the last traces of iron
from the gas. The iron must be watched at every angle and not the slight-
est trace allowed to enter the material anywhere along the process.
It looks to me as though Wahl has laid the foundation for some
real work en this problem.
Sincerely yours
HHBarker: RH
Page data
- Page
- 2
- Source index
- 0
- Type
- photo
- Media ID
- bd376c90dc669900
- Size
- unknown
Document data
- ID
- 75725638
- Core
- doc
- Type
- document
DTO data
{
"id": "75725638",
"sourceUrl": "https://catalog.archives.gov/id/75725638",
"contentType": "document",
"title": "Letters Sent to Dr. Herman Schlundt, August 29, 1930",
"citationUrl": "https://catalog.archives.gov/id/75725638",
"collections": [
"Safety Light Collection",
"Records Related to Radium Dial Painters"
],
"iiifBase": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0002205_Page_1.jpg",
"thumbnailUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0002205_Page_1.jpg",
"largeImageUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0002205_Page_1.jpg",
"imageCount": 3,
"hasImages": true,
"source": "import",
"hasTranscription": false
}
Context sent to Scholar
Document identity
{
"localId": "75725638",
"label": "Letters Sent to Dr. Herman Schlundt, August 29, 1930",
"core": "doc",
"dtoType": "document",
"citationUrl": "https://catalog.archives.gov/id/75725638"
}
Document source metadata
{
"id": "75725638",
"sourceUrl": "https://catalog.archives.gov/id/75725638",
"contentType": "document",
"title": "Letters Sent to Dr. Herman Schlundt, August 29, 1930",
"citationUrl": "https://catalog.archives.gov/id/75725638",
"collections": [
"Safety Light Collection",
"Records Related to Radium Dial Painters"
],
"iiifBase": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0002205_Page_1.jpg",
"thumbnailUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0002205_Page_1.jpg",
"largeImageUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0002205_Page_1.jpg",
"imageCount": 3,
"hasImages": true,
"source": "import",
"hasTranscription": false
}
Document source extras
{
"url": "https://catalog.archives.gov/id/75725638",
"naId": 75725638,
"levelOfDescription": "fileUnit",
"recordType": "description",
"ocrSource": "nara-archive"
}
Page context
{
"seq": 2,
"pageIndex": 0,
"type": "photo",
"url": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0002205_Page_2.jpg",
"mediaId": "bd376c90dc669900",
"ocrText": "2.\nTemperature control is also important, and for accurate work\nsuggest the use of pyrometers. The temperature range between 1000 and\n1100 should be studied.\nIt is obvious that the material should not be crushed after the\nfinal roasting, but when it is immersed in water it should break up into\nvery fine powder automatically. Probably 80 to 903 of our material\npasses a 200 mesh bolting silk without any crushing.\nIt ocours to me that the use of liquid hydrogen sulphide might be\nobjectionable from the standpoint of removing the last traces of iron\nfrom the gas. The iron must be watched at every angle and not the slight-\nest trace allowed to enter the material anywhere along the process.\nIt looks to me as though Wahl has laid the foundation for some\nreal work en this problem.\nSincerely yours\nHHBarker: RH"
}