Fig. 1591.
Fig. 1592.
Thus in [Fig. 1591] (which is from The American Machinist) the pointer is set to 40° and the bevelled face is cut to an angle of 40° with the vertical face as marked. But if the head be graduated as in [Fig. 1592], the face of the planer table being taken as the zero line o, then the swing frame would require to be set over to 30° out of its normal or neutral vertical position as is shown in figure, the bevelled face being at an angle of 50° from a vertical, and 40° from a horizontal line, hence the operator requires to consider whether the number of degrees of angle are marked on the drawing from a zero line that is vertical on one that is horizontal.
Referring again to [Fig. 1588] the slots for the tool post extend fully across the apron, so that the tool posts may be set at any required point in the tool-box width, and the tool or tool holder may be set nearer to the edge of the tool box than is the case when fixed bolts, as in [Fig. 1590], are used, because these bolts come in the way.
