WORKS FOR CREATING SLACKWATER. 145 



should have a play of at least 5 1 j of an inch in their holes, or they will "become so rusted 

 in a few months that their removal, or operation where they act as hinges, will be very 

 difficult. 



Provision should be made for renewing the anchor-bolts of lock and dam-sills, etc., 

 where they are embedded in the masonry, since their exposed, ends will sooner or later 

 rust away. This may be done by putting sleeve-nuts or turnbuckles on them near 

 the top. It will then only be necessary for renewal to excavate to the turnbuckle and 

 to screw in a new end for the bolt. 



Where several locks and dams are to be built, a uniform design should be adopted 

 as far as practicable for all similar parts, so that the machinery of one lock will be 

 interchangeable with that 'of another. This facilitates not only the work of con- 

 struction, but also the work of repairing any parts that become worn or broken. 



After the works have been completed, all debris should be removed and the 

 grounds should be laid out, graded, and planted with grass and trees. Lock-tenders, 

 with a little encouragement, will take pride in keeping their premises trim and in good 

 order, and although it may require some extra expense to secure these results it will 

 be found that it will be very small, and hardly worth considering in view of the gen- 

 eral advantages gained. Moreover, in works of such magnitude and under the charge 

 of the Government, it may justly be claimed that they should be completed and cared 

 for in all respects with a high degree of excellence. 



