144 Chicago Bureau of Public Efficiency 



ment was made to pay for the arc lamps on the basis of eight- 

 tenths horse power per lamp, and at this rate cost per kilowatt 

 hour will be $.0060, or $.0015 per kilowatt hour less than the 

 South Park will pay on the flat rate for which they insisted. 



There are three sub-stations — one each at Douglas, Garfield 

 and Humboldt Parks. Each station requires two operators. This 

 arrangement requires the use of four extra switchboard opera- 

 tors, at an annual expense of $4,000. With all circuits leading 

 out from Garfield Park, four operators at an annual expense of 

 $4,000, as well as part of the switchboard investment at the 

 other two parks, might have been eliminated. To eliminate the 

 two sub-stations now would involve considerable extra expense 

 for copper. This annual saving of $4,000 a year may still be 

 effected, however, by combining the duties of the switchboard 

 operators at Humboldt and Douglas Parks with the duties of fir- 

 ing and caring for the steam engines at those places. Such an 

 arrangement would eliminate four men. Their annual salaries, 

 aggregating $4,000, would in two or three years pay for the new 

 equipment necessary. 



The sub-station at Garfield Park should have been placed 

 in proximity to the boilers and in a fireproof room. There is 

 adequate space therefor, li this had been done and coal and ash 

 handling apparatus installed, one set of switchboard operators 

 each watch might also have cared for the steam plant, thus saving 

 $1,300 in salaries each year. 



The operating expense for the arc lamps during 1910, with 

 an average of 957^ lamps, was $32,097.18. The rate per lamp, 

 therefore, was $33.52. H the $4,000 above noted were deducted, 

 this cost could be reduced to about $29.34 or 12^ per cent, per 

 year. 



During the summer season, one of the 250-horse power hand- 

 fired boilers at Garfield Park is used to supply steam for agitat- 

 ing the road-oil emulsion in a nearby tank. The superintendent 

 states that within another year this emulsion will not be required ; 

 otherwise, it would be more economical to install a smaller boiler 

 to supply the steam. 



The same number of coal passers is employed at the Garfield 



