Jackson, Frank G · London : Chapman & Hall · leaf 228
n the traces of planes, placing a line in a given plane,showing special problems, Sec. The principal lines are paintedon the model .. .. .. .. .. .. .. nett 1 o Large Blackboard folding plane, 44 in. by 30 in., for teaching solidgeometry and projection. This model may be fixed against awall or on… … Cabinet with shelving partitions, to hold the five foregoing models, is well made of pitch pine and varnished .. .. .. nett 1 10 Smaller Blackboard Model, 12 in. by 9 in., as above, with preparedsurface for chalk lines, movable planes, and objects of form, witha third plane to show change of ground…
Decoration and ornament
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