892 PROCEEDINGS OF SECTION J. 



the street, thus making- it a record of all the different private 

 properties throughout the area covered by the survey. 



Upon completion of the plans, or even sooner if necessary, 

 the usual levelhng is carried out; but as this is conducted in 

 the ordinary way it calls for no special attention. Carefully 

 prepared tracings on cloth should be made of those portions 

 of the finished plans which are intended for publication, 

 particular attention being paid to the firmness and equality 

 of the lines on the tracings, as photo-lithographic reproductions 

 are made of them to the same scale. 



From the description of the operations of the survey 

 generally, especially the chainage, it might appear that as a 

 whole a complete detail survey is extremely costly ; but the 

 time occupied over the chainage of the traverses by the detail 

 surveyor bears a very small relation to the rest of the work, 

 not more than about one-fifteenth of the whole, consequently 

 the apparent elaboration in that part of it has little effect 

 upon the total expense. Less care in that particular part of 

 the survey would very materially affect its usefulness as a 

 whole, and would not cause any saving worthy of considera- 

 tion. It must not be forgotten that when once a survey of 

 this kind is completed the main work of it is done for all 

 time ; for, although occasional revisions are necessary on 

 account of alterations in buildings and new erections in order 

 that the plans may be kept up to date, this can be done with- 

 out occupying much time, especially as it is jjossible to fix 

 most new buildings with perfect accuracy by cross measure- 

 ments from those whose positions were definitely determined 

 by the original survey. 



I believe that all engineers who have had any practical 

 experience with sewerage systems agree that an accurate 

 survey showing all buildings, &:c. is necessary. What an 

 advantage, then, would it be to have the work conducted in 

 a thoroughly systematic manner, so that the employing body, 

 whether the Crown or Borough Council, might with true 

 economy incur the comparatively small extra expense 

 required to render such survey absolutely perfect for all the 

 purposes I have striven to describe in the few notes 1 have 

 just read. Certainly it would in future minimise the work in 

 towns for surveyors, except when subdivisions M'ere required, 

 but, carrying out the doctrine of the greatest good to the 

 greatest number, the public would reap the benefit to the 

 fullest extent. Even in cities where detail surveys have 

 already been carried out, they could be made fully available 



