File:California highways; a descriptive record of road development by the state and by such counties as have paved highways (1920) (14594579110).jpg

Identifier: californiahighwa00blow (find matches)
Title: California highways; a descriptive record of road development by the state and by such counties as have paved highways
Year: 1920 (1920s)
Authors: Blow, Ben, 1868-
Subjects: Roads
Publisher: San Francisco
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:
uming that the weight on the block of wood was threeand one-third tons only (it was nearer four tons probably,as the roller carried fuel and water), the load resting upon theconcrete paving four inches thick was equivalent to 1666pounds per inch of width of bearing, the equivalent of awagon with four wheels, each with four-inch tires, carryinga load of thirteen tons equally distributed over the fourwheels; this load being about four times what the pavementmight be expected to carry under the heaviest traffic —assuming this to be a twenty-ton traction engine which, if ofstandard size wheels, would only impose a weight of 555pounds per inch. These tests achieved quite wide publicity and served tosatisfy the public as to the value of the four-inch concreteroad which, it may be said, has proved satisfactory after ausage of more than (ive years on all highways save thosewhere the traffic is great in volume and heavy in individualunits. On these it has proved hardly thick enough, the (36)
Text Appearing After Image:
5 •S ^ So ^ R s ^ -5 R s ^ ^ R § <s *R r .bO <a rel="nofollow"> ^ R « -S • ^ I b ^ ^ R - ; v, ^^ * §.* R ^o .

Note About Images