CONTINUOUS RAILWAY BRAKES. 



185 



cal advantcigo gained by tlio screw-gearing implies a waste 

 of time in getting the brakes "off" and storing power in 

 the springs for tlie next application of the brakes. 



The next brake belongs to Class II. of the Automatic 

 division. Tho brake is — 



"Clark's Chain Brake." 



The friction rollers and friction drum, whose axle carries 

 the chain barrel, are shown in the large diagram. 



The chain, after passing from the barrel on which it is 

 wound, passes over a guide pulley, under another hung in a 

 frame which slides on vortical guides, and then again up 

 over a guide pulley, after which it passes on to the next 

 carriage. 



The bracket carrying the pulley under which tho chain 

 passes, is kept down by spiral springs enveloping tho vertical 

 rods which guide the pulley bracket. 



This guide bracket carries a hook, which hooks over the 

 pin passing through tho ends of the links, whose other ends 

 are attached to tho swing frames carrying the guide pulleys 

 over which the cliain passes. It will bo soen, tliat when the 

 chain is woun<l uj), the bracket carrying the guide pulley 

 rises until tho hook it carries can lay hold of the fulcrum 

 pin of tho thrust rods ; in rising, the bracket compresses 

 the spiral spring, which thus contains a store of power. 



To apply tho brakes, the chain is slackened, by which the 

 springs, through the medium of the bracket and hook, exert 

 a downward pull on tho links, which thrust apart the 

 suspension links carrying tlio chain pulleys ; the pulling rods 

 connected to the brake rigging are likewise attached to 

 these suspension links. Thus, when the suspension links are 

 thrust apart, the brakes are pulled on. 



This brake has been extensively used. It complies with 



