Label on Jullien's Collection of Reliefs France found this new geometry so important to fortification design that it was held as a state secret for several years. An example ... for Descriptive ...

As regards the point and the line, it is nothing more. But what distinguishes descriptive geometry, as it was published to the world in Monge's celebrated treatise, from what was already known to ...

They are intended to show a line (1) by its projections ... commend Mr. Jones's work to students of solid geometry. Descriptive Geometry Models for the use of Students in Schools and Colleges.