3*6 



REPORT OF THE COMMISSIONERS OF 



The best evaporator pans, now in use by the large operators, are made of 

 galvanized iron, cold rolled copper, or, in some instances, of heavy tin plates. They 

 are six inches in depth, from thirty to forty inches wide, and from eight to eighteen 

 feet long. The various sizes are made with a corrugated bottom in order to increase 

 the heating surface. The evaporator rests on brick or iron arches, with flues leading 

 from the fire box to the chimney or smokestack. The pan may be made in one piece 

 the entire length, or may include several connected pans. Where a large product is 

 handled, the evaporator is sixteen or eighteen feet long. 



At intervals of eight to twelve inches partitions are placed in the pan, which are 

 open at the alternate ends ; or, if solid partitions they have holes at either end. The 



THl granite state evaporator and arch. 



sap runs from the storage tank into the evaporator at one end through an automatic 

 regulator, and then flows across the pan, backwards and forwards several times, around 

 the end of the partitions, until it reaches the outlet at the finishing end, by which time 

 it is reduced to syrup of the desired density. The regulator, which is connected with 

 the storage tank by a rubber hose, increases or diminishes the inflow of sap according 

 * Manufactured by the Granite State Evaporator Company, Albany, N. Y. 



