
a 652 
oye T Sept: 
NEW PATENTS. 
Ii will forma REGULAR PART of oux future plan to prefent the Public with an abridget 
Jfretch of the fpecifications of all new Patents As SOON AS THEY ARE ENROLLED. 
We have no doubi but Parentces will liberally contribute towards the perfecivon of our plan, 
by tranfmitting copies of their fpecifications, and we have na hefitation in afferting, that 
&) 
our plan itfelf is fraught equally with benefit to the Public and to the Patentees- Such of 
our readers as wifh for more exatt information, will doubtiefs bave recoutfe to the offices 
of Enrollment 1a Chancery-lane. 
Canat Locks- 
Oo’ the 2nd of Augutt, the {pecifica- 
tion of a patent was enrolled in_ the 
Petty Bag Office, by Jonn Luxe, Efq. 
of Treviles, in the county of Cornwall, for 
a new mode of lifting, drawing, and con- 
veying loaded and light boats out of one 
canal into another, inftead of the prefent 
mode by means of locks. The invention 
confifts of an inclined plane, running from 
the furface of the upper to that of the 
lower eanal, witha fyftem of machinery 
at the upper end of it, by which the boats 
are drawn up and let down the plane. Phe 
machinery confifts of a water-wheel, that 
is turned by aftream let in upon it from the* 
upper canal, with other~heels conneéied 
therewith, and with the rope that paffcs- 
ever a pulley, and connects with the car- 
riage in which the boat is placed ; alfo of a 
loaded veffel, called a tun, which affifts 
and regulates the machinery, and which 
‘moves up and down a correfponding and 
arallel plane, but in a direction oppofite 
ro that of the boat. In cafe of a fearcity 
“ef water, the principal axle of the ma- 
chinery is fupplied with a hand-turn, 
which is of fufficient power to anfwer the 
purpofe of the warer-wheel. ‘The con- 
srivances for lifting up and letting down 
the carriage of the boat from the water fur- 
face of one canal to that of the other is 
fimple, and well calculated, fer the pur- 
pote. 
British POT-AsH. 
Mr. Rospert HoaKkesty, of the city 
of Chefter, merchant, has Jately en- 
rolled the fpecification of a patent. for a 
method of making Britith pot-efh, for the 
ufe of all kinds of manufaéiures, in which 
forcign pot-aih, or any alkali, is ufeful. 
The pot-afh is made of the following ma- 
terials, viz. Englith, Scotch, Welch, er 
Trifh kelp, fereign barilla, or falts ob- 
tained from foap !eys by evaperation, or m 
their calcined ftate, commonly called black 
alhes, or of foap waites. It may be made 
of any of the above materials, mixed with 
cnly a certain proportion of the falts ex- 
geadted from foap leys; or by mixing Gers 
a 
tain proportions of any two or more toge- 
ther, fo as to fuit the particular manufac- 
tures it may be adapted for. It is alto 
made of rock falt, mixed with a certais 
proportion of any foreign or other alkali. 
Fhe materials are pounded or ground 
into fmall pieces, and fuch kinds as are 
defigned to make a pot-afl of a particular 
quality, are mixed together. They are 
then thrown mto an oven, or furnace, of a 
particular” and very fimple “ conftruétion, 
and there, by means of an extraordimary 
degree of heat, are melted into fo liquid 
a ftate as to run out with great eafe at a 
channel made in a convenient part of -the 
even, or furnace, and there colleéted inte 
pots. Either of the kinds, when cold, 
affume the appearance of foreign pot-alh, 
and are ufed without farther pyoeefs. 
The fuperior property of this mvention 
is, that it feparates, and difperfes from all 
kinds of kelp, barilla, and rock falt, much 
heterogeneous matter (particularly earth 
and common falt) and thereby renders the 
alkali contained in thefe fubftances more 
pure. This muft neceflarily make a great 
faving in the expences of alkali, and of 
labour ia the application of it, ia all manu- 
fadtures, where kelp and barilla are uled 
in their rude ftate, it being well known, 
that the earth, and other heterogeneous 
matter, contained in thefe articles, prevent, 
in a very great degree, the operation of 
the alkali they contain., By this inver- 
tion, alfo, kelp, barilla, and reck fait, 
may be ufe.' in manufactures, in which 
their former rude {tate entirely prevented 
their ufe ; which he conceives will bs 
of great public utility. 
BRIDGES. 
Row.anp BurpDOoN, Efy. of Harley- 
ftreet, Cavendifh-iquare, and of Cafile 
Eden, Durham, and M.P. for that coun- 
ty, has lately enrolled the {pecification of a 
patent for his invention of a certain mode 
or manner of making, uniting, and ap- 
plying, cali-iron blocks, to be fubftituted 
in lieu of -kevfones in the conftrnétion of 
arches; the faid  caft-iron blocks being 
kept in their proper pofition, and naas rs 
ast 
