Note 7 — I. TECHNICAL PROCESSES IN THE MAKING OF MODERN POTTERY AND THEIR APPLICATION TO THE TECHNIQUE OF ANCIENT VASES
Reading edition
The jigger is the technical word for the wheel on which shapes are moulded with the aid of a jolly or profile; but it can be used for other purposes. The difference between an ordinary wheel and a jigger is that in the former the speed is changeable, in the latter fixed.