File:GageBlocks 012.jpg

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Description

English: Bureau of Standards machinists lapped precision gage blocks, manufactured at the Bureau, to exact nominal length (1919)

Date

1919

Collection

National Institute of Standards and Technology

	Native name	NIST
	Parent institution	United States Department of Commerce
	Location	Gaithersburg, Maryland, United States
	Coordinates	39° 08′ 29.29″ N, 77° 13′ 03.97″ W
	Established	1901
	Website	NIST.gov
	Authority file	: Q176691 VIAF: 131110795 ISNI: 0000000405068207 ULAN: 500273889 LCCN: n88112126 NLA: 35602026 WorldCat

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from NIST Photographic Collection, Gage Blocks

Source/Photographer

NIST Photo Gallery / Gage Blocks

Permission
(Reusing this file)

This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:25, 25 February 2014		5,608 × 4,338 (20.15 MB)	NISTResearchLibrary (talk \| contribs)

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This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Image title	After being brought to approximate dimensions by machining, the blocks are hardened, heat-treated, and ground to slightly more than the nominal length. They are then "lapped" in the machines here shown, and brought to exact nominal length within 0.000005 inches. The gaging surfaces are also plane and parallel within this amount.
Author	National Institute of Standards and Technology
Copyright holder	The images in the Gage Blocks Photographic Collection are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder. Use of the images from NIST Digital Collections is not restricted, but a statement of attribution is required. Please use the following attribution statement: "National Institute of Standards and Technology Digital Collections, Gaithersburg, MD 20899."
Headline	National Institute of Standards and Technology
Source	Gage Blocks Photographic Collection
Short title	Lapping precision gage blocks
Width	5,608 px
Height	4,338 px
Bits per component	8 8 8
Compression scheme	Uncompressed
Pixel composition	RGB
Orientation	Normal
Number of components	3
Horizontal resolution	600 dpi
Vertical resolution	600 dpi
Data arrangement	chunky format
Software used	Adobe Photoshop CS6 (Windows)
File change date and time	12:05, 20 May 2013
Exif version	2.21
Color space	Uncalibrated
Date and time of digitizing	09:56, 5 March 2013
Date metadata was last modified	08:05, 20 May 2013
Original transmission location code	1646-2
Unique ID of original document	xmp.did:A22D140A3387E211AA9791EFE403D87E
Keywords	United States. National Bureau of Standards--History--Photograph collections. Gage blocks--Photograph collections.
Contact information	library@nist.gov 100 Bureau Dr, MS 2500 Gaithersburg, MD, 20899 301-975-3052
IIM version	4

File:GageBlocks 012.jpg

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