1797) 
(. 221 +} 
~ 
NEW PATENTS 
Enrolled in the Months of February and March. 
Mr. Nasu’s [Ron BRIDGE. 
For ARCHES, Prers, DAMs, and SPAN- 
DRILS, formed of plaie tron, caft, fram- 
ed, or put together, fo as to form hollow 
bodies, capable cf being filled. up with 
earth, fand, clay, brick, fione, gravel, or 
any folid comjofition ; or ufed for ibe fup- 
port of planks, or any other covering, or 
put together hollow, without being filled 
wn 
N the 7th of February, letters pa- 
/ tent were granted to Mr. Joun 
NasH, architeét, of Dover-ftrcet, Lon- 
don, for his invention of am iron bridge, 
on anew and improved conftruétion. 
The arch of this bridge is formed by 
hollow frames or boxes, each box con- 
fifting of four fides, and a flat bottom.— 
The fides form the arch joints of the 
bridge, and are diminifhed, fo as to tend 
towards the centre of the circle. When 
thefe boxes, or frames, are put together, 
fide by fide, they form the arch of the 
bridge, the joints of which have a folid 
bearing throughout, like thofe of fione 
bridges. 
The boxes are afterwards filled with 
clay, or fand, or gravel, or gravel mixed 
with lime, or fand mixed with lime, or 
rough ftone, or rough ftone mafonry, cr 
bricks, or free-ftone, or any other fub- 
Rance, fo that when filled, the arch is 
one folid body, cafed with iron. 
‘The boxes may be of caft iron, or of 
wrought iron ; or may be caft, rolled, or 
hammered, in flat plates, and framed and 
put together. 
‘They may be caft without bottoms, 
and the loofe bottoms put in; or they 
may be caft with bottoms ; or they may 
be ufed without bottoms, or filling up, 
and be boarded, or plated, over at top, 
and the road filled in; or the boxes may 
be formed of a fucceflion of arches, with 
flanches, forming the arch joints, and 
filled up in the fpandrils, or not filled up ; 
or they may be formed of hollow cylin- 
ders, with flanches. 
The arch joints may have fheet lead, 
er any other compofition, placed between 
them, to fill up the uneven furfaces of 
the iron, and prevent the preffure of 
iron againft iron. 
The arch joints, or flanchings, may be 
{crewed together; or ftubbs, or tenants, 
and fitted with vorrefpondent holes, mor- 
tices, and grooves, may be caft in the 
plates themfelves, and fit into each other. 
The fkirting, or kirb, which keeps in 
the ground, may be caft, or framed, with 
the boxes ; or be caft feparate, and put 
on, or may be omitted. 
When two, three, or more arches, are 
put together, the fpandrils, or {paces, 
between the arches, are formed by hol- 
low fpandrils of wrought iron, or caf 
iron, and framed, or caft, as before-men- 
tioned; and may, or may not, be filled 
up folid, as the boxes of the arches be- 
fore defcribed. Thefe hollow {pandrils 
may be cylindrical, triangular, quadran- 
gular, or polyangular. 
‘The piers of thefe bridges are formed 
like the boxes, hollow, and may be flledin 
folid, or otherwife, and may be of plate 
iron, either wrought or caft, and put to- 
gether, or framed; or they may be: caft 
"in ope piece ;—may be in form cylindri- 
cal, triangular, quadrangular, or poly- 
angular, 
‘The piers, formed of hollow bodies 
of iron, are attached to the bed of-the 
river, by hollow plates,..nailed to the 
ground by piles of plate iron, grooved, 
rebated, or dove-tailed, into each other ; 
and may be caft with the hollow frames, 
forming the piers, or be faftened tothem. 
The dam is aifo formed hollow by 
piles of plate-iron, crooved,, rebated, and 
dove-tailed into eachother; which, when 
fixed into each other, form, a holiow box, 
and when inferted into the bed of the 
river, make a dam, for fhe pier; and 
when the pier is, built, are_driven into 
the bed of the river, and make a box of 
clove-tail piles, inclofing the ground on 
which the pier flands, and fecuring it 
from being undermined by, the water 
palling through the arch. 
Mr. SHELDRAKE’s METHOD OF CUR- 
ING DEFORMITIES IN CHILDREN. 
Cn the 24th of January, letters pa- 
tent were granted to Mr. Tamopuy 
SHELDRAKE,trufs- maker, of the Strand, 
London, for his newly-invented method : 
of curing the deformities which arife 
from, or are connected with, diftortion, 
in the Ferm, or in the Combination, of 
the bones, 
TYhe principle of this invention con- 
fifis in the continually repeated and va- 
Bi th op pats 


