THE models are six in number. They are intended to show a line (1) by its projections, (2) by its traces; the inclination of an oblique plane (3) to the vertical plane, (4) to the horizontal plane; ...

WHEN our Civil and Military Engineering Examinations are daily making larger demands for geometrical proficiency a new and exceedingly lucid Note-book on Descriptive Geometry comes well-timed. Though ...

The use of the overhead projector (OP) as a teaching aid has spread very rapidly and widely and is recommended by educators, but its effectiveness in general and in specific subjects has not been ...