Weekly Arizona journal-miner., 1906-09-05

be made up by taxpayers in some form or another. .es,.
 By dividing our interest .ecstJ by the number of customers 1 find thai it amounts to &3.06 per month, while the average operating expense IS si.96 per customer per month, making total of $5o2, and as we have 290 minimum customers out of a total of 600. tho main burden falls on our largest water customers, and these are the ones I nm expecting to benefit by the cleo. trical installation.
 believe you win agree with me that when the sale of lights (which is practically a by.product of our water departmcnD shall make up the dcaci- cncy. it will benefit the resident dis. tricts, which contains the greatest number of minimum customers as well as the business center of the city.
 I stand ready to verify the figures and estimates given you covering the cost of installing and operating the municipal electric lighting department, if installed in connection with our municipal water system, as set forth in my report to you under date of July 7fh. 1906. can also verify costs of production as set forth in my report, from actual costs of operating our old plant at Del Rio, as further set forth in my report to the water committee under date of March 1st. 1905, covering the operating expense of the Del Rio pumping station for the 12 months end. ing December 3Ist, 19Ot.
 | Respectfully submitted. | CHAS. q. GLASS,
 Supt. Water Works.
 Engineer Beldsn's Report.
 Prescott, Ariz., Aug. 24tb, 1908. To the Honorable Mayor an City
 Council of tho City of Prescott, Ariz.
 Gentlemen: As directed by your honorable body. I submit herewith a report on the estimated cost of sup. plying electricity to the city of Pres. colt. and residents thereof, from the electrical plant at the city water works pumping station at Del Rio.
 In calculating the cost of supplying electricity from central stations the most important items of expense are as follows;
 | l. Interest on investment.
 2. Taxes and insurance.
 T. Depreciation of plant.
 [. Operating expenses and maintcn ance of plant.
 In this report all the operating cx. pepses of the electric plant are in cluded in the cost of supplying cleo tricity. However. as the engines boilers. generating equipment, elec tric trsa-sipssipn line. etc, or dread, installed. and the items of interest oI investment. depreciation of plant, etc. , go on. whether electricity is supplied o not, these items of cost are not includ ed.
 I All the fixed charges, interest, deprc , citation. etc. on the additional invest f ment required for distributing an, . supplying 10 the city and private con f sumers, electricity up to the capacit. , of the plant now installed, are includ cd in the estimated cost of clectricit, h per k. ". hour.
 0 The generating equipment at De l. Rio was found io be of the highest ci fciency type available in the prcsen state of the art, consisting of wate tube high pressure boiler, steam super
 heater, and compound eondensing er
 zines of high grade type, belted diree ]. to revolving field A, c. generator. .
 vacuum of 26 inch. reduced to se
 level. can be maintained at min l. mum cost for eondcnsing wate O Plenty of water available at q lift Q r. few feet for this purpose. F. The total additional expense to op' s rate inc plant at Del Rio supplyin P electricity within ifs present capacit, e will be the cost of the extra fuel r, Il quired. The actual cost of pumpin
 the water at Del Rio will be reduced h 2. the increased efficiency of the plan a when operated near its normal cap' 1T city, above the efficiency when ope D, ating with only n partial load as al pr' r. sent. due to the addition of the pr, e posed electrical load.
 Is TO make clear to the non.technici 3. mind. why if will cost less 10 pun d the water. per one thousand gallon Q, after the addition of the electrici