Accession No

6636

Brief Description

six mathematical armature models of rotational and straight-line motion, plus notes, by A. P. Rollett, English, mid 20th century

Origin

England

Maker

A. P. Rollett

Class

Mathematics; demonstration

Earliest Date

1926

Latest Date

1968

Inscription Date

Material

Paper (card, paper); wood; metal (iron?)

Dimensions

Special Collection

Provenance

Donated on or before 06/06/2016. Made by A.P. Rollett, author of Mathematical Models (1951).

Inscription

Description Notes

6 mathematical armature models of rotational and straight-line motion, plus notes, by A.P. Rollett, English, mid 20th century. Wooden boards with metal armatures, labelled. Accompanied by collection of notes.

6636.1: Watt's Approximate Straight Line Motion. Wooden and metal mathematical model demonstrating Watt's linkage, which demonstrates how a central moving point of the linkage is constrained to travel on an approximation to a straight line. Labelled.

6636.2: Peaucellier's Exact Straight Line Motion (Inversion). Wooden and metal mathematical model demonstrating Peaucellier–Lipkin linkage (the first planar linkage capable of transforming rotary motion into perfect straight-line motion, and vice versa).

6636.3: Hart's Exact Straight Line Motion (Inversion). Wooden and metal mathematical model. Labelled.

6636.4: Tschebychef's Approximate Straight Line Motion. Wooden and metal mathematical model converting rotational motion to approximate straight-line motion.

6636.5: Wooden board which has no metal mechanism attached, which has a label reading: (x2 - 16)2 + (y2-4)2= y4.

6636.6: Kempe's Exact Straight Line Motion. Wooden and metal mathematical model. Labelled.

6636.7: 10 notecards and 8 sheets of card (prototype model? or card model unmade?). 10 notecards pose a series of mathematical problems. The 8 sheets of card each contain one or two cutouts (although some are damaged) and on the adjacent side are multiples/patterns of numbers. On the other side is written 'YES' or 'NO' at opposite ends of the card. Some seem to be incomplete.

6636.8: Kempe's Angle Trisector. Unattached from any board - just a metal mechanism with paper label.

In fair condition. Complete. Two models are very dirty, all are quite dusty.

References

Events