Opposed to the various types of roller gins is the " saw gin," invented by Eli Whitney, an American, in 1792.
Saw gins do considerable damage to the fibre, but for short-stapled cotton they are largely used, owing to their great capacity.
Saw gins are not adapted to long-stapled cottons, such as Sea Island and Egyptian, which are generally ginned by machines of the Macarthy type.
The crop is picked, ginned and baled in the usual way, the Macarthy style action roller gins being almost exclusively employed.
Since about 1875 the Russians have fostered the industry, introducing American Upland varieties, distributing seed free, importing gins, providing instruction, and guaranteeing the purchase of the crops.