1810.] 
[ 159 Jj 
PATENTS LATELY ENROLLED. 
Ee 
MR. JOHN THOMAS GROVES’S (WHITE= 
HALL), for an Improved Mode of Cor- 
structing Buildings, by which Expense 
and Labour are suved, and the Build- 
ing secured from the Dry Rot. 
UE reader must be referred to the 
specification fer the mode adopted 
by the patentee, his description, being a 
mere explication of figures; but the whole 
art appears to consist of making aper- 
tures in every part of the building, for 
the free circulation of the air. In four- 
teen figures, we have plans for internal 
and external walls, which exhibit not 
only the thickness of the walls, but like- 
wise the apertures for the air, and how 
they are introduced between the floors, 
How far Mr. Grove’s plan and method. 
may conduce to the diminution of ex- 
pense and labour, we do not pretend to 
determine, but leave the subject to prac- 
tical surveyors’ and architects: but- we 
Nave much doubt about its being a spe- 
cific against the dry rot. The mere cir- 
culation of air, we suspect, from numerous 
experiments, and well ascertained facts, 
is not in all cases sufficient to prevent 
the evil. This is a disease that requires 
a specific remedy, either as a cure when 
it begins to shew itself, or as a prevens 
tative in cases where the seed is dise 
persed; but at present, perhaps, in a 
dormant or latent state. In our last 
volume, pave 636, we have given an ac- 
count of Mr. Randall’s “ Philosophical 
Enquiry into the Cause, with Directions 
for the Cure of the Dry Rot in Build- 
ings.” To this little work, in connec- 
tion with the invention before us, we 
refer the readers.of the Monthly Maga- 
zine. 
a 
MR. JOSEPH STEPHENSON’S (MORTIMER- 
STREET), for an Improved Machine 
Jor filtering and purifying Water. 
This machine may be made in various 
forms, but the patentee prefers a water- 
tight vessel, in the shape of a chest, 
whose breadth and depth are about 
equal, with a length double of either. 
{In this body, or lower part, and from one 
side to the other, there is to be a divi- 
sion going from the upper face, or cuver 
of the body, down to within about an 
inch of the bottom, and joined to the top 
or cover, and to the sides, in such a man- 
-ner that water cannot pass from one 
compartipent of the body into the other, 
but only through the space left at the 
bottom of the division, For the upper 
ie 
face or cover, there are two openings, — 
one over each compartment, through 
_ which are to be introduced, first, a level 
stratum or layer of sand, previously 
washed to. separate any clay or other 
soluble matter that may be mixed with 
it; over the sand is to be placed a layer 
of grossly pounded charcoal, and over 
this another layer of sand. Things be- 
ing thus disposed, a water-tight vessel is 
to be inserted above the upper surface, 
and descending through it nearly to the 
upper surface of the upper stratum of 
sand. This vessel.is to hold the water 
to be filtered, and at the bottom of it 
sponge is to be placed in such a way as- 
to be compressed by the water above. 
The use of the spoage is to keep back 
the foul matier that may be in the water. 
Without entering intovall the minutia of 
this machine, its operation may be rea- 
dily conceived. The water received into 
the descending branch, passes through 
the cumpressed sponge through a stratum 
of sand, a stratum of charcoal, and 
through another of sand when it reaches 
the bottom of the compartment under 
the descending branch, whence it flows 
through the opening at the bottum of the 
middle division into the other compart- 
ment, and then ascends through a stra- 
tum of charcoal, and through another of 
sand, and rises into the ascending branch ~ 
which serves as a reservoir for the filtered 
water; from this it may be drawn off by 
a cock, or otherwise, as may hapven. 
The sponge must be occasionally taken 
out to be cleaned, and the charcoal, 
after a certain time, must be replaced by 
other that is more pure. The sand also 
must occasionally be replaced or weil 
washed. 
SE 
MR. RICHARD WITTY’s (KINGSTON-UPON= 
HULL), for his Invention of certain 
parts of Rotative Steam Engines. 
‘The improvements set forth in this 
specification, consist in making, arrang- 
ing, and combining, the reciprocating 
rectilinear motion wifh the rotative, in 
such a manner that steam cylinders, - 
with pistons moving in them in a recti- 
linear direction, do at the same time 
turn round upon a_ horizontal axle or 
shaft, and partly form, or constitute, 
what is called the fly-wheel. By this 
combination of the cylinders upon, or in 
a vertical wheel, is effected a complete 
rotative engine, with pistons moving in 
straight lines in their cylinders, (or cys 
hinders 
