HAPTER 
"TORS AND ELEVATORS. 
CONVEYORS present many most admirable features for the 
transport of goods from one place to another within moderate 
limits, provided the supply is sufficient to keep the appliance 
usefully working—that is to say, in general terms, when the 
quantity dealt with exceeds ten tons per hour. 
The drawback of the application of the system to quay 
shed work is the difficulty, if not the impossibility, of 
maintaining a constant succession of packages along the 
same route, and the collateral necessity for a great number 
of independent conveyors to serve different portions of a 
shed. A scheme proposed by Mr. Cecil Bentham to overcome 
this difficulty, by means of a circular route, has already been 
alluded to. Whether such a scheme is practically realisable 
is, of course, a matter largely dependent on a number of local 
circumstances, into which it would be impossible to enter 
here. In this section we merely propose to review the 
general conditions governing the use of conveyors in quay 
sheds. The adaptation of conveyors to coal and bulk grain 
handling is discussed in later chapters. 
TYPES OF CONVEYORS. 
In cases where a system of conveyors is practicable, 
there is a wide range of choice in regard to the type of 
appliance. There are steel, or wooden, slat conveyors and 
steel band or apron conveyors for heavy goods, and canvas, 
jute, rubber, and cotton L:lting for lighter articles. For 
the class of goods generallv I:.1' with in transit sheds, the