J2 SCIENCE OF SUCCESSFUL THRESHING. 



it can pull its load out of the hole by the long hitch, and 

 then be coupled up short again. A cable or rope is elastic 

 and therefore better than a chain, which is liable to snap 

 with the shock of starting the load. Where a rope is used, 

 it should have a ring spliced in one end. The other end may 

 be tied into a shackle or clevis on the engine draw-bar in a 

 "bow-line" knot, which will not slip and is easily untied 

 after being strained. If a chain be used the engine must be 

 moved very slowly, by means of the friction clutch, until all 

 the slack is out of the chain. 



Special High Grouters. Engines for Louisiana, and 

 other swampy localities, are usually fitted with pressed-steel 

 grouters or "mud-hooks," as they are called, which bolt to 

 the traction wheels, in addition to the regular grouters. 

 These are about five inches high and consequently must be 

 taken off before crossing bridges. (They are furnished at 

 an additional price.) 



