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Over the years a variety of record equalization practices emerged and there was no industry standard. For example, in Europe recordings for years required playback with a bass turnover setting of 250–300 Hz and a treble roll-off at 10,000 Hz ranging from 0 to −5 dB or more. In the US there were more varied practices and a tendency to use higher bass turnover frequencies such as 500 Hz as well as a greater treble rolloff like −8.5 dB and even more to record generally higher modulation levels on the record.

What was the industry standard on equalization practices?
Answer: there was no industry standard
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Education is free and compulsory between the ages of 5 and 16  The island has three primary schools for students of age 4 to 11: Harford, Pilling, and St Paul’s. Prince Andrew School provides secondary education for students aged 11 to 18. At the beginning of the academic year 2009-10, 230 students were enrolled in primary school and 286 in secondary school.

What are the 3 primary schools called?
Answer: Harford, Pilling, and St Paul’s
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In principle, the Planck constant could be determined by examining the spectrum of a black-body radiator or the kinetic energy of photoelectrons, and this is how its value was first calculated in the early twentieth century. In practice, these are no longer the most accurate methods. The CODATA value quoted here is based on three watt-balance measurements of KJ2RK and one inter-laboratory determination of the molar volume of silicon, but is mostly determined by a 2007 watt-balance measurement made at the U.S. National Institute of Standards and Technology (NIST). Five other measurements by three different methods were initially considered, but not included in the final refinement as they were too imprecise to affect the result.

What method was was used to obtain the measurement?
Answer:
watt-balance measurement