City roads and pavements suited to cities of moderate size. . lford foundation is then rolled with a steam roller often or more tons weight, until all stones are firmlybedded and none move under the roller. All depres-sions are then filled with stone chips not larger thantwo and one-half inches, and the whole left true andeven and four inches below the line of finished gradeand cross-section. A good workman will average about twenty minutesin setting a square yard of this telford foundation,which may be formed of any kind of quarried rockwhich is most available: cobble-stones are not suitable.
City roads and pavements suited to cities of moderate size. . lford foundation is then rolled with a steam roller often or more tons weight, until all stones are firmlybedded and none move under the roller. All depres-sions are then filled with stone chips not larger thantwo and one-half inches, and the whole left true andeven and four inches below the line of finished gradeand cross-section. A good workman will average about twenty minutesin setting a square yard of this telford foundation,which may be formed of any kind of quarried rockwhich is most available: cobble-stones are not suitable. The practice in 1901 in the states named is hereshown: Sizes of Stone for Telford Foundation, in Inches. STATE. Depth, as SET ONEDGE. Width, as SET. Length,set across ROAD. Remarks Max. Mm. Max. 4 10 10110 Min. Max. Min. jNew Tersev. Mass Conn 86 88 8 586 4 6 4 10 15 6 86 Alternate end-stones double inches gravel rolled on sub-grade as covering formed in one only on unstableground as foundationfor macadam. New York .. 154. CITV ROADS AM) IAVIIMKNTS. The re(juir(jincnts for formin^^ the four inches or sixiiicluS of l)rokcn stone roadway upon this telfordfoundation are tlie same as for re^^ular macadani. ()f the inilea;_;e of l)r()ken-slone roads ])uilt ])y Stateaid (huin^ Kjoo, telford foundation was used for one-sixth in New Jersey, one-seventh in Coiuiecticut, onetliiity-ei^lith in Massachusetts and none in New 1901, New Jersey used tlie same ])ro|)ortion asin 1900. NEKI) OF r>INI)i;K Willi UROKKN SlONK. Macadam required that tlie layer of regular frag-ments sliould l)e s]:)read on the earth roadbed, to l^e con-sohdated ])y the wlieels of ]:)assin^ vehicles, without tlieaid of any fine material or of binder of any sort. This recjuirement was impracticable and j^robal^lycould not be enforced, and exj:)erience has shown thatit is not desirable that it should be enforced. Such fragments, loosely jailed or spread, have aboutforty
Size: 1261px × 1982px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreets, bookyear1902
