This good technique - I hate to call it a hack because it's been either a legal or aspirational standard for decades - is on its last legs in the US as the NERC

This good technique - I hate to call it a hack because it's been either a legal or aspirational standard for decades - is on its last legs in the US as the NERC has or will retire the error corrections that ensured corrections for long term accuracy. Our principal engineer with a history in the power transformer industry tells stories about better times pre 9/11 when utilities would give tours to engineers and describe how the operators would run line frequency corrections overnight to match the dual clocks present, one showing official time, the other showing the usually slightly slower time reflecting the errors accumulated over the day. http://www.nerc.com/pa/Stand/Project%2020101422%20Phase%202%20of%20BARC%20%20BAL004%20DL/BAL-004-0_White_Paper_Clean_09242015.pdf http://www.nerc.com/pa/Stand/Project%2020101422%20Phase%202%... http://www.msnbc.msn.com/id/43532031/ns/technology_and_science-innovation/t/power-grid-experiment-could-confuse-electric-clocks/ http://www.msnbc.msn.com/id/43532031/ns/technology_and_scien...