Online Encyclopedia

Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.

SUNN, or INDIA HEMP (Crotalaria juncea)

Online Encyclopedia
Originally appearing in Volume V26, Page 103 of the 1911 Encyclopedia Britannica.
Spread the word: del.icio.us del.icio.us it!

See also:

SUNN, or See also:INDIA See also:HEMP (Crotalaria juncea)  , a plant which is a native of See also:India and See also:Ceylon . It frequently receives other names, e.g. false See also:hemp, See also:brown hemp, Bombay hemp, See also:Jubbulpore hemp, See also:sana, &c . The plant is an See also:annual, requires a See also:light See also:soil, and is easily cultivated . The ground is ploughed two or three times, and from 8o to 10o lb of See also:seed are sown broadcast . The seedlings quickly appear above the See also:surface, but it is about four months before the plant begins to See also:flower . Sometimes the seed is sown in See also:October for the See also:winter See also:crop, and sometimes in May or See also:June for the summer crop . When the seeds are sown in May, the See also:bright yellow See also:flowers appear in See also:August, when the plant may be gathered . It is not unusual, however, to defer this operation until the seed is ripe, especially if a fibre of See also:great strength is desired . The stems may be pulled up, as is the See also:case with See also:flax, or they may be cut down . Different opinions exist as to whether the stems should be steeped immediately after they are pulled, or See also:left to dry and then steeped: in the wet districts they are taken See also:direct to the See also:water . Since the See also:root ends are much thicker and coarser than the tops, it is See also:common to See also:place the bundles erect, and to immerse the root ends in about a See also:foot of water . Afterwards the bundles are totally immersed in the ponds, and in two to four days the fibre should be ready for stripping .

There is the same danger of over-retting and underretting as in other See also:

fibres, but when the retting is See also:complete, the workmen enter the ponds, take up a handful of stems, and swish them upon the surface of the water until the fibre becomes loose . After the fibre has been peeled off it is hung over poles to dry . When intended for See also:cloth it is combed in See also:order to remove any See also:foreign See also:matter, but if it is intended to be used for rope or similar purposes, the fibres are simply separated and the woody matter combed out with the fingers . The fibre is of a light See also:grey See also:colour, and has an See also:average length of 3 to 4 ft . It is extensively used for rope and cordage and also for See also:paper-making in its native See also:country, but it has made little, if any, progress in this country . According to See also:Warden, the fibre was tried in See also:Dundee in the beginning of the 19th See also:century . About 1820 the See also:price of India hemp See also:bagging, as quoted in the Dundee Advertiser, was lid. per yard below hemp bagging, and ;d. a yard below See also:tow warp bagging . It is stated in See also:Sir G . See also:Watt's See also:Dictionary of the Economic Products of India that a See also:cord 8 in. in See also:size of best See also:Petersburg hemp See also:broke with 14 tons, 8 cwt . 1 qr., while a similar rope of See also:sunn only gave way with 15 tons, 7 cwt. i qr . Roxburgh's experiments with See also:ropes made from this and other fibres appear on p . 607 of the above See also:work .

The ropes were tested in the fresh See also:

state, and also after having been immersed in water for See also:Ito days . His results, reproduced in the following table, show the comparison . Average See also:Weight at which each sort of See also:line broke . Names of the See also:Plants . When fresh . After Ile days' macera- tion . See also:White . Tanned . Tarred . White . Tanned.' Tarred . See also:English hemp, a piece of 10 _ Rotten, as was also new tiller-rope J 5 the English See also:log-line .

Hemp from the See also:

East 74 139 ± All rotten . IndiaCompany's See also:farm 45 near See also:Calcutta . . } 68 69 ----- Rotten 51 65 6o Sunn hemp of the See also:Ben- galese See also:lute (Bunghi-pat) . ---- 4o - 49 ------ 68 0 69 6i It would appear that, after maceration, neither See also:ordinary hemp nor sunn hemp can compare with jute for strength .

End of Article: SUNN, or INDIA HEMP (Crotalaria juncea)
[back]
SUNIUM (Eouw,ov; mod. Cape Colonna)
[next]
SUNNITES

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click and select "copy." Paste it into a website, email, or other HTML document.