[R-390] Megger and Capacitor Measures ... Good vs. Bad ?

[Charles Steinmetz]

Coincidentally, I just ran across some new product announcements from 
1955 that give some leakage specs for capacitors of the day 
("Tele-Tech and Electronic Industries," July 1955 p.82):

1,000 megohm x uF (for one manufacturer's paper and mylar caps)

1,000,000 megohm x uF  (for one manufacturer's polystyrene caps)

10,000 megohms, minimum  (for one manufacturer's ceramic caps)

All of these are way above the ~5 megohm x uF as cited from the 
Diamond Ordnance article.

Best regards,

Charles