Bell recordings

[oakcroft13]

Dave Kelly:

> Another excellent article.

Shoulders of giants and all that, this stuff is more a collation of 
everyone's contributions than my own work.

> It might be useful to mention the addition of a reference recording

Will do. The point about the hour pips is fascinating and useful. I 
measured two brand new 880 Hz tuning forks the other day, they were 
both 10 Hz out! I was about to start blaming the equipment when a 
third, older fork was produced that measured to within 0.1Hz. I think 
MSF Rugby transmits a reference tone of very precise frequency also, 
I forget the details.

Bill H