Pièce 141 - Letter from Joseph Jopling

8 pp

6 Bridge Rd., St. John's Wood - Further to WW's lecture at St. Martin's Hall in which he gave an example of the geometry of a sheet of paper: JJ encloses an example of the generation of three curved lines aided by two strips of paper, a ruler, a fixed point and a T square. A mould is taken of the first curve and the T Square is then used instead of the straight ruler: The same process is then repeated for the third curve. Any other straight line can now be drawn across the three curves. JJ's example 'shows how all the three curves may be generated at the same time by three T squares linked together'. He concludes: 'Many other results can be obtained by such simple repeated movements, and their relations to curved solids made manifest by simple geometrical laws'.