92 B USH-FB U ITS 



"The movable or lifting line of dogs is raised by the head- 

 block, shown at H o in Fig. 16. This device is secured to a tim- 

 ber, c, let into the brick-work, and through which the head, H, 

 plays. The apparatus is moved upwards by means of the lever, 

 L, which works on a chain fastened just below c. A rope, R (see 

 also R in Fig. 22) , drops from the end of the lever to the opera- 

 tor's hand on the first floor. The operator, therefore, pulls down 



rik'. :1J. E\;iporator of W. 11. Bush, Walworth, Wayne Co., N. Y. 



on the rope, moving all the trays up one notch, thus leaving the 

 ^lowest notch free for the insertion of another tray. Looked at 

 from beneath, the head-block presents the outlines shown in dia- 

 gram c, Fig. 17. The attachment of the block to the lifting-rods 

 is shown in diagram D (showing a cross section), and also at T in 

 Fig. 16. 



"While this Culver-Cassidy lifting device is the most common 

 one in western New York, there are still many other styles. The 

 old Alden evaporator, which is now little used, lifted the trays by 



