TAILIEUCHUNG - The Gauge Block Handbook by Ted Doiron and John Beers

The Gauge Block Handbook by Ted Doiron and John Beers Dimensional Metrology Group Precision Engineering Division National Institute of Standards and Technology Preface The Dimensional Metrology Group, and its predecessors at the National Institute of Standards and Technology (formerly the National Bureau of Standards) have been involved in documenting the science of gauge block calibration almost continuously since the seminal work of Peters and Boyd in 1926 [1]. Unfortunately, most of this documentation has been in the form of reports and other internal documents that are difficult for the interested metrologist outside the Institute to obtain. On the occasion of. | The Gauge Block Handbook by Ted Doiron and John Beers Dimensional Metrology Group Precision Engineering Division National Institute of Standards and Technology Preface The Dimensional Metrology Group and its predecessors at the National Institute of Standards and Technology formerly the National Bureau of Standards have been involved in documenting the science of gauge block calibration almost continuously since the seminal work of Peters and Boyd in 1926 1 . Unfortunately most of this documentation has been in the form of reports and other internal documents that are difficult for the interested metrologist outside the Institute to obtain. On the occasion of the latest major revision of our calibration procedures we decided to assemble and extend the existing documentation of the NIST gauge block calibration program into one document. We use the word assemble rather than write because most of the techniques described have been documented by various members of the Dimensional Metrology Group over the last 20 years. Unfortunately much of the work is spread over multiple documents many of the details of the measurement process have changed since the publications were written and many large gaps in coverage exist. It is our hope that this handbook has assembled the best of the previous documentation and extended the coverage to completely describe the current gauge block calibration process. Many of the sections are based on previous documents since very little could be added in coverage. In particular the entire discussion of single wavelength interferometry is due to John Beers 2 the section on preparation of gauge blocks is due to Clyde Tucker 3 the section on the mechanical comparator techniques is predominantly from Beers and Tucker 4 and the appendix on drift eliminating designs is an adaptation for dimensional calibrations of the work of Joseph Cameron 5 on weighing designs. They have however been rewritten to make the handbook consistent in style and coverage.

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• The melt
• Types of inclusions in AI alloys
• Reactions of the melt with its environment
• Surface film formation
• Entrainment
• Entrainment defects
• Separation of CsCl
• LiCl CsCl molten salt by cold finger melt crystallization
• LiCl CsCl molten salt
• Cold finger melt crystallization
• Finger melt crystallization
• Slower cooling gas flow rates
• Melt refining
• Rotary nozzle injector
• Fused carnalite flux
• Salt flux
• Hydrogen reduction
• Journal of Science and Technology
• Investigation of fabrication
• Co Zr based rare earth free hard magnetic alloys
• Melt spinning method
• X ray diffraction
• Vietnam Journal of Earth Sciences
• Geochemistry of late miocene pleistocene
• The Phu Quy island area
• Implication for mantle source feature and melt generation
• The later high alkaline
• Possibly reflecting the involvement of crustal material
• Mass transfer experiments
• The heat load during in vessel retention of core melt
• Obstructing the rising flow
• Volumetric Heat Source
• Facility height of only 0
• 1 m
• Separation of strontium and cesium from ternary
• Quaternary lithium chloride potassium chloride salts via melt crystallization
• The lithium chloride potassium chloride
• Separation of cesium chloride
• Earth Sciences
• Melt inclusions
• Stravaj ophiolite compex
• Shpati massif
• Subductionrelated volcanic rocks
• Plagioclase bearing peridotites
• MnBi hard magnetic material
• MnBi LTP
• Spontaneous magnetization
• As – spun ribbons
• MnBi melt spun ribbons
• Nd Fe B melt
• Spun powder quality estimation based
• Stoner wohlfarth model
• Calculated in detail
• Leptons and quarks