186 SERVICES. 



the levels of the different points with respect to one another, and with the datum, should 

 be distinctly noted, together with remarks on the work, impediments met with, price 

 given for laying, etc., and all dates. 



" If the town to be lighted is of two distinct levels, or has one part so much above or 

 so much below the datum as to require to be supplied by a street-governor, such districts 

 must be indicated in the map by a coloured boundary-line (yellow, for example), and the 

 levels of the upper or lower district, taken from their respective governors as well as 

 from the original datum-line, and marked as before directed in the margin, distinguishing 



35*27 2'25 D G 



the two by letters, as D original datum, G governor, thus : ~-^- ^ > or 3^7 I 9.95' 



The first will signify that the point is 35'27 above the original datum, and 2'25 above the 

 street-governor ; the last as much below. 



" I have frequently been employed to construct maps, after the mains have been laid, 

 companies having found them to be indispensable, if a correct and systematic code for 

 the supply and repairs is to be framed. The time occupied and the expense incurred in 

 the construction of such maps will be evident, besides their necessary imperfections. Of 

 so much importance do I consider correct maps, that I would as soon think of making 

 a steam-engine without a drawing as lighting a town without a map." 



SERVICES. 



Services are wrought-iron or pewter tubes, for the purpose of supplying the 

 interior of houses with gas from the mains ; every small tube on to which a 

 burner is fixed, whether for public or private use, is called a Service. The 

 arrangement of these tubes, and their adaptation to the interior of private 

 dwellings, shops, &c., is a separate branch of business, and " fitters" are 

 almost universally employed, who work quite independently of the Gas Com- 

 pany. Public lights are generally fitted by the Company. 



The few precautions necessary to the proper arrangement of services will 

 be found in the following remarks. It must be obvious that the art of arran- 

 ging the pipes and adapting them, is one of that class of operations in which it 

 is a real saving to employ the best materials and good workmen, to avoid 

 repairs and subsequent alterations of the work. The supply and distribution 

 of the services, or the fitting up, as it is termed by the workmen, may be 

 done almost at any price with regard to workmanship and materials. The 



