EXAMPLES OF WORK
portions for cleaning and coring. Many beds of large dimensions are made
without full patterns from motives of economy. The exterior mould is
Fig. 68.—Formation of Curved
Corner
Fig. 69.—Method of making a Curved Corner
made from a skeleton frame, aided with strickles or sweeping boards, and
cores impart the shapes to the interior portions. In all long and narrow
beds, solid-plated on one face only, the effect of unequal shrinkage is to
Fig. 72
Methods of Blocking adopted for Curves
cause curving or camber, the solid-plated portion when cold becoming
concave lengthwise to the extent of from J in. to | in., depending on the
length. The pattern must be curved in the opposite direction to neutralize
this effect.