Although no reason for this particular choice was given at the time, it was probably to facilitate the use of the seconds pendulum as a secondary standard, as was proposed in the official document.
22.
A user sends their Secondary Standard to the laboratory, where it is exposed to a known amount of radiation ( derived from the Primary Standard ) and a factor is issued to convert the instrument's reading to that dose.
23.
For example, in the late 1980s, the City of San Diego and the Environmental Protection Agency ( EPA ) were involved in a legal dispute over the requirement to treat sewage at the Point Loma Wastewater Treatment Plant to secondary standards.
24.
This is likely an interpretation of the same facts : if it was used as a " secondary standard " that was probably because it was easy to measure .-- Anonymous, 19 : 34 UTC, January 6, 2009.
25.
In this way, accurate and traceable measurements are made; and in fact, these secondary standards are often used to make 3rd standards of end-user equipment by the labs that have the secondary standards-- ALL of them are traceable.
26.
In this way, accurate and traceable measurements are made; and in fact, these secondary standards are often used to make 3rd standards of end-user equipment by the labs that have the secondary standards-- ALL of them are traceable.
27.
Widespread adoption of the 120-hour secondary standard did not occur until the Carnegie Foundation ( established in 1906 ) began to provide retirement pensions ( now known as TIAA-CREF ) for university professors with the qualification that universities must enforce the 120-hour secondary standard.
28.
Widespread adoption of the 120-hour secondary standard did not occur until the Carnegie Foundation ( established in 1906 ) began to provide retirement pensions ( now known as TIAA-CREF ) for university professors with the qualification that universities must enforce the 120-hour secondary standard.
29.
School just have classes up to 5th in very first year but it was upgraded to class 8th in 2008, to 9th in 2009, to 10th in 2010 and the school received Senior secondary standard in 2011 . The school lost his mentor, his first principal on 21 dec 2012 Dr . A . Ramaswamy.
30.
:: If you look at that " historical account ", it specifically says that the carbon-12 scale was suggested because " because of carbon's use as a secondary standard in mass spectrometry " and because it gave numerical values close to the old scale used by chemists ( which was based on a natural mixture of oxygen isotopes ).
