E\ci\r.F.RiM: I'ROHi.r.MS or iiir. ui.i.i. svsn.si 5I'j 



siu.ill Imildiiij-s .iround llu- iil\ , lliiis pl.iriiin the outside (ilaiil costs at 

 .1 iniiiiimini, Ixit iiuTi'.isin^; tlit.' ditVunilt\' and expense of operating so 

 many centers. ()l)\iousIy, therefore, there is some arrangement be- 

 tween the two extremes I ha\e cited wliicli would [)rovide the most 

 economic.d and satisfactory hiyout of tlie plant. .Several test caj.fs, 

 which in the judgment of the engineer seem promising, are, therefore, 

 studied and the most economical and satisfactory |>Ian determined 

 upon. In completed form, these "Fundamental Plans" furnish us the 

 following essential information ujion which lo proceid with the more 

 detailed studies c<nering plant extensions. 



.1. The luunher of centred othce districts which will !)(.■ re(|uitc(l lo 

 provide the telephone service most eioiujmicalh' and tlie hound. ii ics 

 of these central otVice districts. 



1). The number of subscribers" lines to l)e ser\ed b\' i.icli ceiiiral 

 otTice district. 



c. The proper hjcation for the central office in e.ich district lo enable 

 the service to be gi\-en most economically with regard to cost of cable 

 plant, land, buildings and other factors. 



d. The proper streets and alleys in which to build underground 

 conduit in order to result in a comprehensive, consistent and econom- 

 ical distributing system reaching every city block to be ser\'cd by 

 underground cable. 



e. The most economical number of ducts to provide in each con" 

 duit run as it is built. 



Our experience has shown that these fundamental plans reduce 

 guesswork to a minimum by utilizing the experience of years in stufK- 

 ing questions of telephone growth in order to make careful forecasts 

 on the best possible engineering basis. These fundamental plans, 

 together with related studies, thus provide a general program of plant 

 extension to be followed throughout the period for each of our cities 

 and somewhat similar plans are, of course, undertaken for (kti-rniiiiing 

 the future requirements of our intercity or toll facilities. 



ft is evident that both the ultimate arrangement and the program 

 whereby it is to be obtained must have the utmost flexibilit\' in order 

 to meet unforeseen requirements, must work in satisfactoriK' with the 

 existing plant, which represents an investment of over 62. oOl), 1)1)0. ()(),) 

 must meet immediate service reciuirements, and also permit full 

 advantage being taken of new developments in the telephone art. 



The specific or detailed plan for each project of plant extension, 

 whether within the cities as discussed or between cities in the toll line 



