THE HOSE-LEVEL 167 



A good pair of combination nipper pliers for handling 

 and cutting the wire, and so on ; 



A few gallons of clear water free from oil, sediment, 

 and the like. 



216. Suggestions. Half-inch hose is preferable to a 

 larger size. 



Sixty feet of hose is sufficient where the grade stakes are 

 not over 50 feet apart. 



The gauge tubes should have an outside diameter suffi- 

 ciently large to cause them to fit fairly snugly in the ends 

 of the hose. 



The gauge tubes should have the same inside diameter. 

 If they differ materially, the water w r ill rise higher in the 

 tube having the smaller inside diameter. 



There are to be procured on the market, at reasonable 

 prices, coupling-clamps, which are simple and easier to 

 use than wire in closing the ends of the hose about the 

 tubes. 



217. Constructing the hose-level. A tube should be 

 inserted in one end of the hose and firmly clamped. If 

 wire is used to clamp in the tube, the piece should be cut 

 long enough so that after the clamping is accomplished, 

 the end of the wire may be bent into a hook, by which to 

 hang up the end of the level. If a coupling clamp is used 

 to close the hose about the tube, the wire hook should be 

 provided also. 



It is best not to insert the tube at the other end till 

 after the hose has been filled with water ; but wire and tube 

 (or clamp and tube and wire) should be made ready to 

 complete the end, as in the former case, as soon as the hose 

 is filled with water. 



218. Introducing the water. Before starting to fill, 

 it is desirable that the hose be stretched straight upon 



