740 FISHERIES OF THE UNITED STATES. [96] 



Improved snatch-block. 



The outside straps are fastened at the end of the block by a bolt, 

 which prevents the sides of the block from pinching the sheave. 

 To lock and unlock the fastening is very easily accomplished 

 by turning the block or hook to right angles, thus bringing 

 the link even with the lip, which then is slipped off, the rope 

 inserted, and the link replaced. This does away with the bolt 

 and chain. Exhibited by Bagnall & Loud, Boston, Mass. 



Improved seine-block. 



The improvement in this purse-seine block consists chiefly in hav- 

 ing a lip to the slot where the purse-line is put in, and also in 

 being provided with a lubricant that causes the sheave always 

 to revolve easily. Exhibited by Bagnall & Loud, Boston, Mass. 



Seine-block. (Brown's patent.) 



Made of galvanized iron. Used on seine-boats for pursing the 

 mackerel seine. Middletown, Conn. 29,432. Wilcox, Critten- 

 den & Co. 



Purse- seine block. (Merchant's patent, 1882.) 



A galvanized-irou block, with single sheave, triangular shell, ridges 

 on sides to prevent fouling. Gloucester, Mass., 1882. 54,322. 

 Made by Wilcox, Crittenden & Co. Invented by Capt. George 

 Merchant, jr., and intended to take the place of ordinary purse- 

 rmgs at the foot of mackerel seines. 



Patent roller sheave. 



Made of brass. Either the brass or iron roller sheave is much 

 used in blocks. Made by Walter Coleman & Sons. 25,813. 



Improved lug-roller with iron sheave. 



Exhibited by Bagnall & Loud, Boston, Mass. 

 Sheave-roller bushing. 



The rolls revolve on a sleeve or second pin, which in halyard blocks 

 is one and one-half inches in diameter in place of three-quarter 

 inch, thus giving a large bearing for the rolls to revolve on, 

 the wear on the pin in the block being little, if any. Exhibited 

 by Bagnall & Loud, Boston, Mass. 



LUG-ROLLER BUSHING. 



The washer, being flexible, will stay in its place until the rolls are 

 entirely worn out, which is not the case with the old style of 

 roller bushing. Bagnall & Loud, Boston, Mass. 



Dead-eye. 



Made of lignum -vitse wood. Used to fasten standing-rigging to 

 side of vessel. Made by Walter Coleman & Sons. 25,806. 



