189 



it first with a camel's hair brush and then wipe 

 carefully with a chamois skin, wiping with the 

 grain of the finish of the metal and not across it, as 

 in the latter case it is likely to cause scratches. 

 Keep the working and sliding parts absolutely 

 free from dust, as this grinds and will thus soon 

 cause play. 



Use no alcohol on any part of the instrument, as 

 it will remove the lacquer. As the latter is for the 

 purpose of preventing oxydization of the metals, it 

 is important to observe this rule. 



To use the draw-tube impart a spiral motion. 



To lubricate any of the parts, use a slight quan- 

 tity of soft tallow or good clock oil, or parafnne oil. 



If t lie pinion ivorks loose from the jar incident to 

 transportation or long use, which sometimes occurs 

 to such an extent that the body will not remain in 

 position, increase its tension by tightening the 

 screws on pinion cover. 



In using a screiv-driver, grind its two large sur- 

 faces so that they are parallel and not wedge- 

 shape and so it will exactly fit in the slot of the 

 screw-head. 



In inclining the stand always grasp it by the arm 

 and never by the tube, as in the latter case it may 

 loosen the slide or tear off some of the parts. 



When repairs or alterations are necessary, always, 

 have these make by the manufacturers, who can, 



