The tracing stand is nou mounted not on polished agates, but on
rolling ball bearings. The maximum enlargement for direct plot
ting uith the tracing stand pencil is 1.66 times the negative
scale. For reductions, a parallelogram reducing pantograph is
attached to the tracing stand, the plotting then being made on
the right side of the base frame.
Since both the A9 and the B9 are being used for larger scales
than were originally foreseen, the B8 linear pantograph and
a side plotting table are nou available for the B9 (Fig.4) for
enlargements up to 4 times negative scale. Ten pairs of en-
changeable (and invertible) gears provide for a uide range of
enlargements or reductions from model to manuscript scale.
Fiq.5.: Wild STK1 Stereocomparator uith EK6 Electric
Coordinate Printer and SL15 Tape Punch