Geometric chuck, 19th century.

Made:
1839-1900 in London
manufacturer:
Holtzapffel and Company

Compound four-part geometric chuck, by Holtzapffel and Co. with change wheels and accessories, in two mahogany cases; also special stand for operating, with fifteen designs drawn by the pen

Compound four-part geometric chuck by Holtzapffel and Co, with change wheels and accessories. The Geometric Chuck was invented by J H Ibbetson in the early 19th century for the purpose of producing intricate patterns. Generally used on lathes for ornamental turning, this is the only known surviving example of a four stage chuck. The movement of each stage is defined both by its speed of rotation and by the amount the centre is offset compared with the stage below. These two factors give each stage an epicycloidal motion which is superimposed upon the movement imparted from lower stages.

Details

Category:
Mathematics
Object Number:
1921-392
type:
geometric chuck
credit:
Llewelyn Howell, H.

Parts

Parts for compound four-part geometric chuck

Parts for compound four-part geometric chuck

Accessory part for compound four-part geometric chuck, by Holtzapffel and Co.

Object Number:
1921-392 Pt2
type:
component (geometric chuck)