Paper, 'Cassette extraordinaire et admirable pour les mathematiques' [Extraordinary and admirable cassette for mathematics] by unknown author to Robert Moray Text is about a 'cassette' that could be used in the solving of geometrical problems in the measurement of long distances, drawing of maps and topographies, the drawing of sun dials (gnomons), and perspective. Use of the cassette for the geometry given by the following problems which draw the foundations and the four propositions of six of the elements thus announced. Includes a diagram in the text. Subject: Mathematics Inscription on first page reads 'Pour Monsieur le Chevalier Moray' [for Mr Moray the Knight]. [17th century]