FEINTING TYMPANS. 81 



monly been done with leather elevators, or they may be made 

 of caoutchouc whalebone, and cemented on in the process of 

 manufacture. They are used in flour mills for elevating flour 

 and grain, or other articles, from vessels to store-houses, see 

 plate , fig. . The cheapness of this article, as well as its 

 durability, recommends it to the notice of millers in particular. 



CANE ELEVATORS. 



It has been suggested by a gentleman formerly engaged in 

 the manufacture of sugar in Louisiana, that broad India rubber 

 belts, with carriers attached, would be made very superior to the 

 elevators now in use for elevating cane to the grinding mills, 

 when they are placed in the upper story of the building. 



PRINTING TYMPANS. 



During the whole course of the writer's experiments, frequent 

 inquiries have been made of him by different printers and pub- 

 lishers, at different times, whether India rubber fabrics might 

 not be successfully applied for printing tympans. Various ex- 

 periments were made at an early day, both with the common 

 and the vulcanized coated cloths. These experiments failed. 

 Recently a trial has been made of the fibrous cotton fabric, or 

 vegetable leather, -which appears to be completely successful ; 

 and which, if so, is an acquisition to the art of printing. 



