Is thus made. Have a nave turned two inches and a half diameter, and
three long; then let half an inch of that end which faces the first
wheel be turned so as to fit easy into the tin barrel of the first
mutation, which must turn round it without touching; on the other end
of the block, fix a tin barrel B, Nᵒ. 2, this barrel must be six
inches in length, and only half an inch of it to fit on the block.
Round the nave fix five spokes, one inch and a half in length each;
the diameter of the spokes must be equal to a two ounce former; on
these spokes put five seven inch two ounce cases of spur fire, and
carry leaders from the mouth of one to the other, that they may all
light together; then from the mouth of one of the cases, carry a
leader, through a hole bored slantways in the nave, from between the
spokes, to the front of the block near the spindle hole; the end of
this leader must project out of the hole into the barrel of the first
mutation, so that when the pipe which comes from the end of the last
case on the first wheel flashes, it may take fire and light the second
mutation. To communicate the fire to the third mutation bore a hole
near the bottom of one of the five cases, to the composition, and from
thence carry a leader into a hole made in the middle of the barrel B;
this hole must be covered with pasted paper.