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The acceleration, velocity, and space are recorded in ink on a paper ribbon as the body falls, by means of a vibrating spring carrying a brush pencil.

The release of the weight and vibrator is automatic. The wheel is of aluminium, and is accurately mounted on ball bearings.

Trolley Apparatus and Inclined Plane (Fig. 2), devised by G. Fletcher, Esq., H.M. Inspector of Schools.

FIG. 2.

This apparatus is used for measuring the acceleration of a heavy carriage travelling down an inclined plane, or the acceleration due to a force pulling up the plane.

It consists of a long loaded trolley on which a strip of paper is fastened. A steel vibrator tuned to a definite period is provided carrying a brush, by means of which a wave curve is described upon the paper.

From this curve the acceleration and velocity of the trolley may be obtained.

Two trolleys may be used in collision, and the acceleration due to impact determined in the same manner.

Models for illustrating Practical and Descriptive Geometry, consisting of folding planes and coloured strings to indicate lines and planes, intersections of planes, planes tangential to solids. The theory of orthographic projection, the conception of points and lines in space, by referring to fixed planes of projection.

Solid Geometrical Models in Section illustrating the penetration of Solids, measurements of solids, volumes and densities.

Microscopical and Lantern Slides for teaching geology, botany, zoology, and other sciences.

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