This volume contains engineering plans and information used in determining the construction plan and the cost of various central stations. Included is information about the number of lamps and their candle power and about the type, size, and dimension of the building intended to house the central station. A floor plan of the building and miscellaneous other information about the prospective central station are also included. The Construction Department's mapping and determination department probably extracted this data from reports submitted by canvassers. The book contains 192 numbered pages. Only 16 pages have been used.