From Keith Walters
The story about the instructions for mixing 1 pint of water with 410 grams of
evaporated milk to get 1 litre of milk
(Feedback, 13 June) reminds me of an
article I read some years ago in an American telecoms magazine. It referred to a
particular type of telephone cable as having an attenuation factor of so many
decibels “per 5.28 kft”. Only recently, when I was reading another article, did
I realise that “kft” means “kilofeet”, or 1000 feet.
And why “5.28”? Well, that’s 5280 feet—or a mile in the old
currency.
keithW@panavision.com.au
