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| Keywords: GageBlocks 006.jpg Left Light-box and true-planes used in testing precision gage blocks by the interference of light waves Right Precision gage blocks with faces so nearly perfect in planeness that the blocks are held together by molecular attraction with a force sufficient to suspend the weight of several blocks when held in the vise by the end block National Institute of Standards and Technology National Institute of Standards and Technology 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 PD-USGov National Bureau of Standards National Institute of Standards and Technology Gauge blocks Measuring instruments engineering Calibration | ||||
