1804.] 
the tube the thong or wire, and make it 
faft to the jaws of the heaver, and heave 
it tight. If the handles of the htaver are 
too near‘or too far from each other, for 
the convenience of the man that regifers 
the ftrand, alter the bolt till it is right, 
and every thing is ready to begin to re- 
gifter the ftrand. It being determined 
how hard the rope is to be laid, the index 
is to be fixed accord ingly on the arc, and 
taking a few tyrns with the hook, keeping 
the heaver tight to comprefs the ase the 
guage is to be tried, and the regiftering c 
regulated. 
Tf three (lrands are regiftering together, 
it rnuft be a triple regilter in one frame ; 
there 1s, however, no y neceflity to try but 
one ftrand with ‘the guage, if the yarns 
are of the fame kind. The ftrands being 
regiftered, muft be made fait to the book 
in the common way, equally tight. For 
laying, the index of the guage being al- 
tered, the correfponding numbers muft be 
ufed; then turning the hooks of the 
firands till the outfide fheil of yarns cor- 
refpond with the tongue of the guage, 
and begin tolay the rope. In regiftering, 
a fufficient weight is laid upon the hock 
to prevent its ‘being drawn towards the 
machine, 
cme a 
MR. THOMAS KENTISH’s (BAKER- 
STREET) for an improved DERRICK, 
Scr loading and unloading Ships, Sc. 
The principal parts of this machinery 
are a purchafe-whcel, properly. faftened ; 
a roller to take the rope of that wheel; a 
-break-wheel, and a lever to prefs on this 
to lower the weight down; a racket-wheel 
and paul to top the roller trom going 
back when hoifting up the weight; a 
fhip’s maft, or a poft in the ground on 
fhore with a guy, a fhieve. to keep the rope 
extended, and ahook on which the weight 
is fixed. 
‘By the cranes, of almoft any conftruc- 
tion, there is little difficulty in raifing.a 
weight; but accidents too frequently hap- 
pen in lowering the Jever. ~The common 
method of delivering a cargo from fhips 
ig by a large luff tackle, fixed to the head 
of the derrick, the end of the face being 
brought to the eapltan, by which four 
men can with difficulty raife a hogthead 
of fugar; but it requires, at leaft, five 
to lower one down with fafety ; the 
weight frequently overpowers that num- 
ber, and cbliges them to drop from the 
bars. 
_ To prevent fuch accidents, Mr. K. 
has invented the roller with two inclined 
planes to his derrick ; three turns or more 
with great weight of rope, fiom the pur-. 
New Patents lately enrolleds rst 55 
chafe wheel at the head, areto turn round 
the centre of the roller, which is taken 
off as the weight afcends, by a finall rol- 
les, with two “inclined planes: placed a 
little above the large roller, a man holding 
or drawing the rope off until the weight 
is as high as wanted; then the lever is 
prefled on the break-wheel, by a weight 
at thé end, fufficient to eho the rolier, 
and make it perfectly eafy to the man or 
boy to eafe the rope away as fait or as 
flow as he pleafes. The weight being 
checked by three powers—the boy holding 
on the rope, the handle te the roller, ane: 
the lever prefling’6n the break-wheel. 
The derrick may be applied to various 
ufes on fhere, on board his Majefty’s fhips 
in ordinary, hofpital and lata fhips, or 
to get in the guns and ftores of a man of 
war, by a few hands, befure the proper 
officers and fhip’s company are ordered on 
board. The wheel ve roller may be ap- 
plied to hoift up water from a deep weil, 
and it will bring up a large quantity, with 
lefs ftrength and Jabour than is now re- 
quired by. a common wheel and pinion ;— 
to hoifling up hoats on board men of war 
or merchant fhips with niore eafe and ex- 
pedition than by the common tackle; and 
to lowering them with fafety, as fhe meft 
go down in a horizontal pefition into the | 
water, and is difengaged ina moment, 
which prevents accidents, particularly 
when the fhip has flernway, the boat is 
often in danger under the counter, before 
the tackle can be unhooked. Four men 
will be fufficient to deliver a fugar fhip, 
which with a capftan requires eight. With 
the derrick, we are alfo affured by the 
Patentee, that there is a faving of time, 
and of rope; and the machine itfelf is 
net liable to get out of order. It will 
laft as long as the fhip; and, if an acci- 
dgnt occur, it is fo fimple, that any me- 
chanic can repair it. 
MR. ROBERT RANSOME’S (1PSWICH) 
for a Method of making and tempering 
CAST-IRON PLOUGH-SHARES, &c. 
To make the /kares, the melted pig- 
iron is poured into a mould, prepared for 
the purpofe, formed with one fide or part 
of iron, and the other fide or part of fand 
or loam. ‘The fide of the fhare, when 
caft, that lays next the iron mould, wili 
be hard, and of a proper temper, while 
the other fide that is formed in fand or 
leam will be foft; and if made of the 
beft pig-iron, the fhare will be much — 
ftrengthened. 
a The moulds are thus made;-a_ well- 
n 
ifhed thare, made either of iron or other 
metal, is laid ae {and or loam, care- 
fully 
¢ 
