Fundamental Principles of Engineering Nanometrology, 2nd Edition

List of Figures

Figure 2.1	An ancient Egyptian cubit (a standard of mass is also shown)	8
Figure 2.2	Metal bar length standards (gauge blocks and length bars)	11
Figure 2.3	The UK’s official copy of the prototype X-section metre bar (Photo courtesy Andrew Lewis)	12
Figure 2.4	An iodine-stabilised helium–neon laser based at NPL, UK	13
Figure 2.5	Kilogram 18 held at NPL, UK	15
Figure 2.6	An autocollimator being used to check the angular capability of a machine tool (Courtesy of Taylor Hobson)	17
Figure 2.7	Traceability	18
Figure 2.8	The difference between accuracy and precision. The reference value may be the true value or a calibrated value, abscissa is the value of the measurand and the ordinate is the probability density of the measured ...