"30 Report on the Exhibition of Implements, 
The chain in its simplest form consists of a plain hinged 
link. The hinge has a groove, in width about one-third of the 
circumference of the opening. The link is flattened out on one 
side, at the opposite end to the hinge, to the thickness of the 
groove, and thus enables the links to be joined together bv merely 
passing the plain end of the link into the corresponding hinge 
in the next link. As the chain can onlv be threaded together 
at the angle shown in the illustration, and as it runs, when at 
Fig. 26. 
Avork, with the groove outwards, it cannot possibly fall to pieces 
in work ; whilst every link being interchangeable enables it to 
be lengthened or shortened with the greatest dispatch. These 
chains are available for many purposes, and are especially valu- 
able for carrving elevator buckets. !Mr. Ley has latelv executed 
orders for rice elevators for Rangoon, to raise 100 quarters per 
hour to a height of 50 feet ; for cement-clinker elevators, to 
raise from 18 to 20 tons per hour ; also elevators for brick- 
machines and linseed-cake mills, for discharging coals out of 
ships' holds, lifting sewage-water, »Scc., including a chain-and- 
bucket pump to lift water out of a mine shaft, the miners putting 
in more links and buckets as they lower the " shaft." Our 
readers are probably aware that this form of chain has been 
adopted in all self-binding reaping-machines in America, and 
answers admirably. The following are some of the advantages 
of chain-gearing over leather or india-rubber fittings : — 1. Posi- 
tive transmission of power. 2. Stands exposure to wet or heat. 
3. Much less liable to break. 4. No expense in belt-fasteners. 
5. No friction. G. No tension. 7. No stretching. 8. No loss 
of time, as, if the chain breaks, any one can put in a new link. 
9. Less costly, being only about half the price of ordinary belting 
of corresponding strength. The sprocket-wheels are also much 
cheaper than turned pulleys. They should be accurately made. 
The pitch of the teeth should very slightly exceed that of the 
chain, so as to enable the teeth to gain on the chain. 
Messrs. Pohjhlavh (irid Co., of Newton Abbot, Devon, were 
