797°] cae 
ay) 
NO Wo hE IN TB, 
Enrolled in the Months of ‘fuly and Augu/t. 
Mr. GLaAzeEBROOK’s New 
MecHanic Force. 
ON the 7th of February, letters patent 
weré granted to Mr. J. Guaze- 
BROOK, of Hadley, Shropfhire, en- 
gineer, for an apparatus for converting 
the elaftic power of the atmofphere in- 
toa new mechanic force.’ 
Mr. GriazeBrook deferibes his in- 
vention to be a method of increafing the 
elaftic force of compreffed cool air; by 
the application of moifture and heat, and 
afterwards admitting it into proper veffels 
to act again{ft piftons, fluids, &c. asa 
mechanic force. This he performs by 
~ compreffing the ait in fuch quantities, 
and in fuch a {pace, that when damped 
with water, in order to increafe its 
elaftic power, and that when heated by 
fire, in order to increafe its expanfion, 
the air will occupy a {pace in the com- 
preffor or forcing pump, capable of raifing a 
column of mercury 90 inches in height, 
befide the weight of the atmofphere. 
This being the fubftantive’ bafis and ra- 
dical property pf the firft principle of the 
difeovery, an extenfion of the tcale,. ac- 
cording to the power required of any 
machine, will produce the defired effect. 
The apparatus made ufe of by Mr. 
GLAZEBROOK, in the profecution of 
his difcovery, comprifes a forcing pump, 
to comprefs the cool air; a /uturasor, for 
the purpofe of damping air with water, 
in order to increafe its elatticity, and 
beaters, for the purpofe of expanding the 
atmofpheric fluid when compreffed in 
AIR-VESSELS. A defcription of the 
feveral vehicles would be fuperfluous, as 
Mr. GLAZEBROOK obferves that thofe 
he made ufe of are {uch as neceffity dic- 
tated as bef for the elucidation of the 
difcovery; and that farther improve-: 
ments meray be made thereon by others, 
while he contents himfelf with the fug- 
geftion of the original principle. 
Mr. SLATER s Loom. 
On the ath of July, letters patent were 
granted to Mr. J. SLATER, of Sharples, 
Bolton-le-Moor, Laneathire, merchant, 
‘for an improvement in the loom in 
which bleached and dyed linens, muflins, 
cottons, &c. are finifhed. 
The ons hitherto made ule of for 
the purpofe of finifhing in the cotton and, 
linen branches were capable of contain- 
ing only feven yards of each piece at one 
time, from a prevalent opinion of the 
impoflibility of imcreafing the clamps 
I 
with fafetv and convenience : Mr. Sia- 
TER, however, has been at confiderable 
expence in trying the experiment, whe- 
ther the loom could not be increaied in its 
dimenfions, fo as to contain a whole 
piece at one time, in which he has fuc+ 
ceeded beyond his utmoft expectations. 
Mr. RicHarpson’s Optica 
Machine. 
On the 4th of July, letters patent were 
granted to ivir. J. R:cHARDSON, of St. 
Giles’s, optician, for a convenient me- 
thod of increafing the magnifying pow- 
ers of fpeétacles, and of every other 
defcription of vitual glaffes, 
Perfons who make ule of fpe€tacles, 
and other glaffes for affitting the fight, 
are frequently compelled to have. two - 
glaffes, of different numbers, for the in- 
{pe¢tion of diferent objeéts. which ma 
be at a greater or leis diftance ; thus, 
for example, the {peétacles ufed ~for 
reading will not always fuit for long 
diftances, as in the ftreet, theatre, &c. 
but Mr. RicHarpson has invented a 
glafs (wiaeb, however, be has not defcribed 
in bis fpecificaiion) that, being placed be- 
fore the ordinary fpectacles, opera-glafs, 
&c. increafes itslength of vifion, at the 
diferetion of the wearer, without em- 
ploying a /ccond pair for that purpofe. 
Mr. JouNnson’s WaATER-PROOF 
ComMPouND. 
On the 7th of july, ierters patent 
were granted to Mr. H. JouNson, of 
London, gentleman, for a water-proof 
compound, the application of which to: 
linens, woollens, &c. makes them Capa 
bie of effectually refifting water, rain, 
oc. 
This blanching lixivium of Mr. 
JOHNSON’s invention, comprifes 2 moft 
tedious chemical procefs, and a nume- 
rous lft of ingredients, the principal of 
which are, fqueezed lemon peeis, or fifh- 
guts, offals, &c. and gall, boiled for 
four hours, to which is added a quanti- 
ty of barlla afhes. When the linen, 
woollen, &c. is prepared by it, he-di- 
re€ts India rubber to be diffolved in 
{pirits of turpentine, and the fmell 
thereof fuppreffed by oil of wormwood. 
Into this diffclution is to be infufed 
chopped ‘coney or other wool. It is 
then to be applied to one fide of the 
linen, or woollen, and, when dry, it 
will form a lining capable of refitting 
moifture or danip of any defcrip- 
tion, 
ORIGINAL - 

