> 
4823.) 
such water, or other fluid or fluids, to 
escape as aforesaid; that is to say, by 
forcing other water, or other flaid or 
fluids, into the generator, until the pres- 
sure against the steam-valve shall cause 
it to rise, the valve being so loaded as 
not to rise, except by means of such 
extra pressure as aforesaid. 
Fourthly, for the general application 
of such water, or other fluid or fluids, 
so heated as aforesaid, and of the steam 
or vapour generated thereby, whether 
such steam or vapour be employed 
through a steam-pipe without a steam- 
chamber or reservoir, to act immedi- 
ately ou the piston, or to be collected 
in a reservoir or steam-chamber, and 
thence to act on the piston, or only for 
heating water to generate other steam, 
or for any other purpose or purposes 
whatsoever ; provided always that such 
general application as aforesaid be for 
the purposes of steam-engines, 
—— 
To ALEXANDER Lawy of the Commer- 
cial-road, Founder; for an Improve- 
ment in the Form of Bolts and Nails 
for Ships, and other Fastenings.— 
July 17, 1821. bth 0% 
‘This improvement consists in giving 
the bolts and nails used for ships and 
other fastenings such a form or figure, 
that, when once driven home into their 
place, they cannot work themselves out 
by jars or strains, and this he effects by 
forming them with fonr, five, or a 
greater number of sides, and conse- 
quently as many interveping angles; 
and making the said sides and angles to 
wind round the axis of the bolt or nail 
in a screw form, so that the said bolts 
or nails, when in the act of being driven 
into a hole of proper size, revolve on 
their axis, as they are made to advance 
by the force applied to them; and the 
pieces therewith bolted together are 
held much more securely than they 
would be with common bolts; as the 
bo!ts thus formed cannot be drawn from 
either the one piece or the other, there- 
with bolted together, by any of the 
common strains to which such fasten- 
ings are exposed, without absolutely 
tearing ont a portion of the solid sub- 
stance of the wood. Of these improved 
bolts and nails a proper idea may be 
formed, by conceiving them, in the 
provess of manufactaring them, to be 
formed in the first place into polygonal 
rods or prisms, of as many sides and in- 
tervening angles as may be required, 
any portion of which rod, if equably 
twisted, would assume a screwed ap- 
New Patents and Mechanical Inventions. 
255 
earance, and would in fact present a 
ind of screwed bolts, composed of as 
many threads as they were angles ori- 
ginally given to the piece of rod before 
being thus twisted; and stch a picce of 
polygonal rod, when thus treated, may 
be considered as a bolt or nail of my 
said improved form.— Repertory. 
LIST OF PATENTS FOR NEW INVENTIONS. 
Edward Ollerenshaw, of Manchester, 
hat-manufacturer ; for a method of dressing 
and furnishing hats, by means of certain 
machinery and imp!ements to be used and. 
applied thereto.— May 27, 1823, 
fhomas Peel, of Manchester, esq. for 
a rotary-engine for the purpose of com- 
municating motion by means of steam or 
other gaseous media.—May 97. 
Stephen Wilson, of Streatham, esq.; for 
certain improvements in machinery for 
weaving and winding. Communicated to 
him by certain foreigners residing abroad. 
—May 531. 
John Mills, of Si!ver-street, London; 
and Herman Wiliiam Fairman, merchants ; 
for certain improvements in rendering 
leather, linen, fiax, sail-cloth, and certain 
other articles, water-proof. Communi- 
cated to them by a certain foreigner re- 
siding abroad.—May 31. 
Richard Badnall, of Leek, silk-manufac- 
turer; for certain improvements in dyeing. 
—June 5. 
Thomas Attwood, of Birmingham, 
banker; for certain improvements in the 
making of. cylinders tor the printing of 
cottons, calicos, ar:d other articles. Com- 
n.unicated to him by a person residing 
abroad.—June 3. 
Thomas Mills, of Dudbridge, near 
Stroud, cloth-dresser ; for certain improve- 
ments on machines for shearing or cropping 
woollen cloths. Communicated to him 
by certain foreigners residing abroad.— 
June 5. 
Jacob Perkins, late of Philadelphia, bnt 
now of Fleet-street, London, engineer ; for 
certezn improvements in steam-engines. 
Partly communicated to him by a certain 
foreigner residing abroad.—June 5. 
Edward Cowper, of Kennington, me- 
cianist; for certain improvements | in 
machines and apparatus for printing ca- 
lico, linen, silk, wool, paper, and other 
substances capable of receiving printed 
impressions.—June 10. 
Robert Mushet, of the Royal Mint 
Tower-hill, gentleman ; fur mean or means, 
process or processes, for improving the 
quality of copper and alloyed copper, ap- 
plicable to the sheathing of ships and other 
purposes.—June 14. 
*,* Copies of the specifications, or further 
notices of any of these inventions, will be 
inseried free of expense, on being Lransmitted 
to the Editor, 
VARIETIES, 
