Bulletin - Geological Survey, Issue 8Geological Survey., 1901 |
From inside the book
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Page 125
... epidote and pyrite . The hornblende , which is the most abundant mineral , has a pale - green color , and appears in the form of irregular crystals and plates with numerous inclusions of epidote . Many of the crystals of hornblende show ...
... epidote and pyrite . The hornblende , which is the most abundant mineral , has a pale - green color , and appears in the form of irregular crystals and plates with numerous inclusions of epidote . Many of the crystals of hornblende show ...
Page 135
... epidote , with some pyrite and cal- cite . The hornblende is mostly prismatic and fibrous in outline , although allotriomorphic grains occur , in which both cleavages are well developed . The epidote occurs in irregular small grains ...
... epidote , with some pyrite and cal- cite . The hornblende is mostly prismatic and fibrous in outline , although allotriomorphic grains occur , in which both cleavages are well developed . The epidote occurs in irregular small grains ...
Page 136
... epidote , are found scattered through the section . The two micas are intimately associated , and are present , in about equal proportions . Both are drawn out into long , narrow strips , which are grouped into layers , arranged in the ...
... epidote , are found scattered through the section . The two micas are intimately associated , and are present , in about equal proportions . Both are drawn out into long , narrow strips , which are grouped into layers , arranged in the ...
Page 142
... epidote and chlorite . The horn- blende is very abundant , making up fully 90 per cent . of the en- tire rock mass . It occurs mostly in the form of irregular crystals , which often show prismatic cleavage . Both the green and brown ...
... epidote and chlorite . The horn- blende is very abundant , making up fully 90 per cent . of the en- tire rock mass . It occurs mostly in the form of irregular crystals , which often show prismatic cleavage . Both the green and brown ...
Page 156
... epidote , all of which are readily distinguishable by the unaided eyes . The biotite is quite abundant , forming the greater part of the entire rock - mass . It occurs , mostly in the form of elongated plates and shreds , with their ...
... epidote , all of which are readily distinguishable by the unaided eyes . The biotite is quite abundant , forming the greater part of the entire rock - mass . It occurs , mostly in the form of elongated plates and shreds , with their ...
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Common terms and phrases
abundant amount of money approximate road-mileage augite ber of miles biotite broken stones chain-gang chert clay commutation-tax compact consists constructed and maintained convict labor cost COUNTY Area Crystalline area crystals diabase dike diorite drains epidote exposure fair condition feet feldspar fine-grained frequently Fulton county Georgia GEORGIA PLATE gneisses graded road grains granites gravel Heard county highways hornblende hornblende-schist improvement inches layer limestone macadamized road magnetite maintained by statute Mass MATERIALS OF GEORGIA microscope miles of graded miles of macadamized minerals money annually raised mountainous number of miles olivine olivine-diabase places plagioclase poses public-road pur public-road purposes quartz raised for public-road ridges road material road purposes ROAD-BUILDING MATERIALS road-construction road-machine roadbed ROADS AND ROAD-BUILDING roads are constructed roadways sand sandstone schists scrapers special road-tax square miles statute labor streams subject to road-duty suitable for road-surfacing superintendent surface thickness throughout the county Topographically traffic trap rock usually vicinity wagons widely distributed
Popular passages
Page 44 - The middle eighteen feet of pavement is to be coated with hard stones to the depth of six inches. Four of these six inches to be first put on and worked in by carriages and horses; care being taken to rake in the ruts until the surface becomes firm and consolidated, after which the remaining two inches are to be put on.
Page 13 - At such times obstructions and quarrels were frequent, and the path was sometimes blocked up during a long time by carriers, neither of whom would break the way. It happened almost every day, that coaches stuck fast, until a team of cattle could be procured from some neighbouring farm, to tug them out of the slough.
Page 44 - All the irregularities of the upper part of the said pavement are to be broken off by the hammer, and all the interstices to be filled with stone chips firmly wedged or packed by hand with a light hammer, so that when the whole pavement is finished there shall be a convexity of four inches in the breadth of fifteen feet from the centre.
Page 44 - Upon the level bed, prepared for the road materials, a bottom course, or layer of stones, is to be set by hand, in form of a close, firm pavement. The stones set in the middle of the road are to be...
Page 47 - The stones became rounded by the excessive attrition, they were subjected to, their more angular parts wearing away, and the weaker and smaller ones being crushed. The experiment was not •pushed beyond this point. It was...
Page 14 - His coach was, with great difficulty, and by the help of many hands, brought after him entire. In general, carriages were taken to pieces at Conway, and borne, on the shoulders of stout Welsh peasants, to the Menai Straits.
Page 12 - It was conducted over pathless sierras buried in snow; galleries were cut for leagues through the living rock; rivers were crossed by means of bridges that swung suspended in the air; precipices were scaled by stairways hewn out of the native bed; ravines of hideous depth were filled up with solid masonry; in short, all the difficulties that beset a wild and mountainous region, and which might appal the most courageous engineer of modern times, were encountered and successfully overcome.
Page 13 - It was only in fine weather that the whole breadth of the road was available for wheeled vehicles. Often the mud lay deep on the right and the left ; and only a narrow track of firm ground rose above the quagmire.
Page 90 - A large number of tests on meadows, pastures, stubble land, corn ground and plowed ground In every condition, from dry, hard and firm to very wet and soft, show without a single exception a large difference in draft in favor of the broad tires. This difference ranged from 17 to 120 per cent.
Page 12 - ... stone pillars, in the manner of European milestones, were erected at stated intervals of somewhat more than a league, all along the route. Its breadth scarcely exceeded twenty feet. It was built of heavy flags of freestone, and in some parts, at least, covered with a bituminous cement, which time has made harder than the stone itself.