[ 94a j 
‘T alfo fend a plan of a Drag, or heavy harrow, 
which I think fimplerand better, without a joint. It 
will work: .a-piece of ground fix feet’ three inches 
broad, Jeaving intervals of five inches between the 
tracks. ‘This is conftructed on the fame principle as 
the other, for the principle is a general and fimple 
one, and is applicable to harrows of any fize, or for 
any purpofe; as the intervals between the tracksmay | 
be varied at pleafure, {till preferving their regularity. 
I have fometimes made the fpikes in the form of 
the coulter of a plough; but I find that it anfwers as 
well, and is fimpler and cheaper, to make them of 
f{quare iron, pointed and bent forward diagonally; 
and care muft be taken to fix them in the pofts in 
fuch amanner, as- that the line of the. track may pafs 
through the angles of the fpike, as at A in the plan. 
JT have tried different ways of applying the draft, © 
but have found none anfwer fo well as thofe repre- . 
fented in the drawings annexed; and I recommend, 
that in the chain of the heavy harrow the three 
centre links at B may be made round, in order that. 
the draft-chain may be fixed to whichever of them 
may, on trial, be found to anfwer beft. 
Having found much advantage from the ufe of 
_ this harrow, (whichis more effe€ual in its work 
than thoféin common ufe, from the manner in which 4 
the fpikes are arranged, and is cheaper from there 
being fewer of them) I with to give others an op- 
portunity of trying it, and for that purpofe commit 
it 
