After the decline of its woollen trade Tiverton became noted for the lace manufacture introduced by John Heathcoat (1783-1861), inventor of the bobbin net frame.
Let R = the revolutions per second of the flyer; r = the revolutions per second of the bobbin; d = the diameter of bobbin shaft plus the material; L = the length of sliver delivered per second; then (R - r) d.
It is easy to see from the above expression that if the bobbin were the "leader" its speed would have to decrease as it filled.
In most of the experiments the measurements were made by suddenly withdrawing the bobbin from its place ron FIG.
You must be careful always to have the correct bobbin lifted over the other.
