166 



Improved Agricultural Drainage Level- 



The New Drainage Level has been constructed for the use 

 of the Farmer, the Land Steward, and persons superintending 

 Drainage operations, on a cheap, simple, and efficient prin- 

 ciple. It may be carried in the pocket, and is not at all liable 

 to get out of order. Its use may be readily acquired by any 

 ordinary workman, and in the hands of a person who has had 

 a little practice with it^ it is capable of showing the difference 

 of level between two places, however distant, with great ac- 

 curacy. 



The Level is represented in the preceding figure, and con- 

 sists of an achromatic telescope, with cross lines, which gives the 

 instrument a great advantage over all those constructed with 

 plain sights only, as a staff painted white, and divided by black 

 lines into inches, can be read distinctly at the distance of 80 or 

 100 yards. 



The telescope tube is made rather wide, to admit the spirit tube, 

 without interfering with the vision, being placed inside, for greater 

 protection ; the bubble of which is seen through an opening in the 

 upper part of the telescope. 



There is a bar placed under the telescope and attached to it by 

 a joint at one end and a screw at the other; with this screw the 

 telescope and bubble are accurately adjusted to the horizontal 



