132 
AN IMPORTANT DISCOVERY IN WEAVING ELASTIC FABRICS. 
tiferous ores to be fused with the siilphurct 
produced by the previous or first clxarge, 
whether such sulphuret be the x’esult of ap- 
plying sulphur or iron pyrites to calcined 
argenitiferous ores, or the result of argenti- 
ferous ores, containing sufficient sulphur as 
above described. In witness whex’eof, Sec. 
Enrolled December 22, 1835. 
SPECIFICATION OF THE PATENT 
GRANTED TO JAMES VINCENT 
DESGRAND, OF SIZE LANE, IN 
THE CITY OF LONDON, MER- 
CHANT, FOR A CERTAIN METHOD 
OF WEAVING ELASTIC FABRICS. 
I, the said James Vincent Desgrand, do 
hereby declare that the said invention of a 
certain method of weaving elastic fabrics, 
consists in the weaving of such fabrics in 
any suitable looms of ordinary construction, 
with bare or uncovered stiangs or cords of 
caoutchouc or India-rubber interwoven, if 
necessary, with any of the kinds of spun 
threads or yarns which are commonly xised 
in weaving, whether composed of silk, cotton, 
tlax, wool, or other fibrous materials ; the 
said bax'e strings or cords of caoutchouc or 
India-rubber being in till cases used ixi the 
said method of weaving elastic fabrics, with- 
out applying any previous covering of silk or 
other thread aroxxnd such strings or cox’ds. 
The said bare strings or cords of caout- 
chouc or India-rubber lieing in soxne cases used 
to form the warp of the elastic fabric, spun 
tlireads or yarns of any sxxitable fibrous ma- 
terials being used for the weft, or as part of 
the weft ; or in other cases the said bare 
strings or cords of caoutchouc or India-rub- 
ber being used for or as part of the weft, 
the warix being composed of spun threads or 
yarns. Or in other cases such cox'ds or strings 
of caoutchouc or ludia-x-ubber being used both 
for the warp or as part thereof, and also for 
the weft or as part thereof. And the said 
weaving of bare or uncovered sti-ings or cords 
of caoutchouc, either wither without combi- 
nation with spuxx yarns or threads of any 
of the kinds usually woven, in looms maybe 
perforxned in looms of the ordinary con- 
struction by the ordinax'y maxxipulations 
of weaving other fabrics, those manipula- 
tions being conducted wdth the aid of 
certain precautions wdxich I will hereinafter 
point out. The elastic fabiic prodxxced by 
the said xnethod of weaving bare or unco- 
vered cords or strings of caoutchouc or In- 
dia-rxibber will possess more or less elasti- 
city in one or both directions according to 
the quantity and arrangement of the unco- 
vered caoutchouc strings or cords that ax'e 
interwoven into the said elastic fabrics ; the 
aforesaid caoutchouc coxxls or strings are 
formed in the same manner as hex-etofore px-ac- 
tised for producing such cords or strings, 
viz., by cxitting caoutchouc or India-rubber 
into thixi strips, and stretching them out in 
length and winding them upon bobbins ox- 
reels, where they are left for a sufficient time 
until they have entirely or in great part lost 
their natural elasticity. 
And as- before sTated they may then be 
woven according to the aforesaid xnethod 
either alone to produce an entirely elastic 
fabric or they may be combined in several 
Avays with spun threads or yarns of other 
kinds of materials to produce partly elastic 
fabrics. Byway of example I wall state some 
of the kinds of elastic fabrics which may be 
woven according to the said method. 
For instance, I sometimes forxn the warp 
exxtirely of barecox’ds or strings of caoutchouc, 
or else it may be partly of such cords ox- 
strings and partly of spun yarns or threads 
of suitable xnatei-ial, and I introduce that 
warp into a loom of an ordinary constrxxction, 
which is harnessed suitable for the textury 
of the fabric that I intend to v/eave ; and I 
work the loom so as to caxxse the w’arp to be 
opened and separated by the hax-ness in a 
proper order for all the bax-e cox-ds or strings 
of caoxxtchouc in the Avarp, as Avell as the 
spun yarns or threads that may form a pai-t 
of the Avarp, to be more or less covered and 
concealed by the threads of the weft : the 
latter being, in this case composed of spun 
yarns, or thx-eads of cotton, silk, AAmrsted, ox- 
other like fibroxxs material. Wlien the Avarp 
consists as aforesaid of strings or cox-ds of 
bare caoutchouc with spun yax-ns of some 
other xnaterial interxningled, the spun threads 
or yarns of such material are wound on a 
separate yarn-beam from the beam Avhereon 
the cords or strings of caoutchouc ax-e wound, 
and all the yax-ns, cords, or strings, that axe 
to foi-xn the warp, are brought froxn their 
several beams through the eyes of the proper 
heddles, with suitable arrangexnent to pro- 
duce the kixid of fabric desired, whether the 
same be dimity, or satin, or twilled stuff, ox- 
other of the fabrics vAvoven usually in looms 
of known constrxxction. Another kixid of 
elastic fabric may be woven by the said 
method, by forming a portion of the wai-p of 
spun thx-eads or yax-ns of cotton or silk, ox- 
other like filamexitous material wound on one 
or more yarn-beams, and another portioxi 
of the Avarp of cords or strings of bare 
caoutchouc Avound on another beam. The 
said strings or cox-ds of caoutchouc and spun 
yax-ns or threads being properly intermingled 
and brought together into one warp in the 
loom, axid the loom being so harnessed and 
wox-ked, that in the woven fabric, the 
caoutchouc cox-ds or stx-ixigs Avill be enclosed 
betweexi two complete webs or av oven fab x-ics, 
one above them and one beloAV them, the 
shuttle being throAvn sometimes above and 
sometimes below the caoutchouc cords ox- 
strings ; and the order of the opening of the 
warp is such, that the spun threads of cotton, 
or silk, or other like material in the warp, 
or certain of the same, pass in and out fx-om 
the upper web to the lower, that is, the same 
warp-thx-ead will be found in the woven 
fabric to pass over one of the weft-thx-eads 
of the upper web, then down between the 
berecords or strings of caoutchouc ofthcAvarp, 
and under a weft-thread of the loAver w-eb, 
and then up again, and so on. The bare 
cox-ds or stx-ings of caoutchouc are thus sepa- 
rated one from the other in the woven fabric. 
