Make a crane, with a screw and bale, for taking up
and putting down the stone. (See it represented in
Plate XL, fig. 2 and 3.) Set the post out of the way as
much as possible, let it be 9 by 6 inches in the middle,
the arm 9 by 6, the brace 6 by 4; make a hole plumb
over the spindle, for the screw ; put an iron washer on
the arm under the female screw, nail it fast ; the length of
the screw in the worm part should exceed half the dia-
meter of the stone, and it should reach 10 inches below it;
the bale must touch only at the ends to give the stone
liberty to turn, the pins to be 7 inches long, li thick, the
bale to be 2| inches wide in the middle, and 1| inch
wide at the end; the whole should be made of the best



310 O^ MAKING A HOOP FOR THE MILMTTONE. [Chi^ 91.
iron ; for if either of them break, the danger would be
great ; the holes in the stones should be nearest to the up-
per side of it. Raise the runner by the crane, screw, and
bale, turn it and lay it down, with the horns of the driving
ryne in their right places, as marked, it being down, as
it appears in Plate aXL, fig. 9. Make the lighter staff
CC, to raise and lower the stone in grinding, about 6 feet
long, 3i by 2| inches at the large end, and 2 inches
square at the small end, with a knob on the upper side.
