File:Report on the investigation of engineer and janitor service, Board of education, city of Chicago (1913) (14591540288).jpg

Identifier: reportoninvestig02chic (find matches)
Title: Report on the investigation of engineer and janitor service, Board of education, city of Chicago
Year: 1913 (1910s)
Authors: Chicago (Ill.). Civil Service Commission Campbell, Harmon M
Subjects: Janitors Public schools
Publisher: (Chicago, H.G. Adair)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
average yearly coal consumption for each school building, the coalconsumption for the periods October 1, 1911, to March 1, 1912, and October 1, 1912, toMarch 1, 1913, was averaged and added to the coal consumption for the period March 1,1912, to October 1, 1912. This gave an average for the winter months of the severeseason of 1911-1912 and the mild season of 1912-1913, and the spring and summermonths of 1912. The coal consumptions thus obtained have been plotted for each school building,as shown in Exhibit E. Each point shown in this exhibit gives the floor area of theschool building and the tons coal consumption. The school reference numbers setopposite the points plotted are those given in the Board of Education classification andare shown in Table B. Those schools which were not in operation for the full periodor which were enlarged during the period between October. 1911, and March, 1913, havenot been included in this analysis and are not shown in the Exhibit E. Several other 17
Text Appearing After Image:
schools for which the coal consumption record is obviously wrong have also beenomitted. It will be seen that the mean or average curve drawn through points in ExhibitE^ is practically a straight line, which indicates that the coal consumption (otherthings being equal) is directly proportional to the floor area of a building. Considera-tion of other elements that enter into the amount of coal burned seems to indicatethat they are relatively of small importance. When the nature of the heating and ventilating problem as applied to schoolbuildings is further considered, it appears reasonable to expect the points to be generallycloser to the mean. In school buildings of the same size, no matter what their ageor type of architecture, the heating system in each involves the heating of practically thesame amount of fresh air per minute. Where the boiler and ventilating equipments insuch buildings are similar, it seems reasonable to expect that the coal consumptionshould not vary more than a f

Note About Images