NBS Special Publication, Issue 250U.S. Government Printing Office, 1965 |
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... surface of the earth , in the atmosphere , and in outer space . Among other things , it conducts research on the nature of radio waves , the media through which they are transmitted , and the mechanisms by which they are propagated ; it ...
... surface of the earth , in the atmosphere , and in outer space . Among other things , it conducts research on the nature of radio waves , the media through which they are transmitted , and the mechanisms by which they are propagated ; it ...
Page 20
... surfaces , and pressure . ) Resistance determinations made in the laboratory at rated current may therefore be of little value because the working temperature conditions cannot be duplicated . The best experimental procedure to use in ...
... surfaces , and pressure . ) Resistance determinations made in the laboratory at rated current may therefore be of little value because the working temperature conditions cannot be duplicated . The best experimental procedure to use in ...
Page 21
... surface or volume moisture may affect the ratios . Such ratio changes are normally less on low than on high ratios . This effect can be reduced or eliminated by constructions which provide built - in guard electrodes , maintained at ...
... surface or volume moisture may affect the ratios . Such ratio changes are normally less on low than on high ratios . This effect can be reduced or eliminated by constructions which provide built - in guard electrodes , maintained at ...
Page 51
... surface . The specular component of the reflected energy is thus diverted away from the entrance aperture towards a ... surfaces ) " excluded " from , the measurements . This is covered in items j and k . Only one Vitrolite working ...
... surface . The specular component of the reflected energy is thus diverted away from the entrance aperture towards a ... surfaces ) " excluded " from , the measurements . This is covered in items j and k . Only one Vitrolite working ...
Page 56
... surface of glass , reception of all reflected flux regardless of angle . Reflectance of white backing taken so as to accord with Bausch & Lomb type photoelectric opacimeter correctly adjusted to read contrast - ratio for thin samples ...
... surface of glass , reception of all reflected flux regardless of angle . Reflectance of white backing taken so as to accord with Bausch & Lomb type photoelectric opacimeter correctly adjusted to read contrast - ratio for thin samples ...
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Common terms and phrases
Ac-dc accepted for calibration accuracy additional American Standards Association API Standard apparatus Appendix attenuators bolometer bolometer units bulb and liquid Bureau of Standards calibration or test changes in emf charged dependent color temperature condenser microphones current fees decibels Determination diameter Electric electrode electromotive force end of table errors exceeding footnote at end frequency Gage blocks gages-determination glass Group of Standard higher or lower hygrometers ice-point reading indications inductors instruments Invar Item Description Fee laboratory length liquid column mass measurements meter National Reference Group ohms perature phase angle plug Precision pressure Radium ratio reference standards REPORT OF CALIBRATION resistance thermometer resistors ring gages sample saturated standard cells schedule special tests specifications spectrophotometer stability standard resistors submitted for calibration tabulated corrections apply temperature range test points test_ tests not covered thermal conductivity thermocouple thermometer was tested U.S. DEPARTMENT uncertainty voltage dividers waveguide weights
Popular passages
Page 11 - Standard Reference Materials issued by the National Bureau of Standards to calibrate a measurement system, or to produce scientific data that can be referred to a common base. A schedule of prices and amounts, as well as directions for ordering, is included.
Page 49 - ... index markers. Since it is necessary to determine the shift of the principal point resulting from prism effect in the lens, the equivalent focal length of the lens as mounted In the camera is incidentally determined...
Page 55 - ... wire loops, spring balances, tension handles, or other attachments liable to be detached or changed in shape. The error in the total length of the tape, when supported horizontally throughout its length at the standard temperature of 68° F. (20° C.) and at standard tension, shall not be more than 0.1 inch per 100 feet (2 mm per 25 m).