[pianotech] Stringmaking Question

[Ron Nossaman]

John Delacour wrote:

>  I have never understood why people in some other countries 
> prefer measurements.  It takes the technician (with or without a helper) 
> far longer to measure the 40 or 50 strings, type it all out and send the 
> order than the ten minutes it takes to get a precise rubbing that will 
> enable the stringmaker to produce a near-perfect copper line.

Without measurements, how do you calculate the elongation to 
determine where the wrap ends under tension, in relation to 
the bridge pin, and especially the agraffe?
Ron N