Jackson, Frank G · London : Chapman & Hall · leaf 223
or begin-ners, and is used in conjunctionwith the Glass Plane. Three sim-ple objects, for example — threesquares in wood of the same sizeand shape are placed one above,one on a level with, and one belowthe eye. The position of the eyeis fixed by the ring of the GlassPlane. The difference… … Chapman and Hall, Limited, 11, Henrietta Street. 33 THE DARLINGTON SOLID GEOMETRYSLATEBOARD. Consisting of a DarlingtonSpecial B Slateboard, divided inthe centre, so that the lower por-tion can be adjusted in a horizontalposition to the vertical upper half,and so that the solid can be placedin the…
Decoration and ornament
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