A Treatise on Roads: Wherein the Principles on which Roads Should be Made are Explained and Illustrated, by the Plans, Specifications, and Contracts Made Use of by Thomas Telford, Esq. on the Holyhead RoadLongman, Orme, Brown, Green and Longmans, 1838 - 465 páginas |
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Página 27
... spirit level . The road from Dumfries to Castle Douglas was traced out by him , so as to have no greater inclination than 1 in 40 , although passing through a very hilly country . Mr. Abercromby pursued , as a regular profession , the ...
... spirit level . The road from Dumfries to Castle Douglas was traced out by him , so as to have no greater inclination than 1 in 40 , although passing through a very hilly country . Mr. Abercromby pursued , as a regular profession , the ...
Página 37
... spirit - level is essentially necessary to show the proper line of road to be selected . The general rule to be followed in surveys is to pre- serve the straight line , except when it becomes necessary to leave it to gain the rate of ...
... spirit - level is essentially necessary to show the proper line of road to be selected . The general rule to be followed in surveys is to pre- serve the straight line , except when it becomes necessary to leave it to gain the rate of ...
Página 253
... spirit level , besides two levels on the limb set at right angles to each other , and a magnetic needle or compass in the centre , which is of use in getting the magnetic bearing of any line in the survey , or of taking the bearings ...
... spirit level , besides two levels on the limb set at right angles to each other , and a magnetic needle or compass in the centre , which is of use in getting the magnetic bearing of any line in the survey , or of taking the bearings ...
Página 254
... spirit levels , so as to be perfectly level . The eye piece of the telescope is moved in or out until the hairs are seen distinctly ; and the object glass is adjusted to distinct vision , according to the distance of the levelling staff ...
... spirit levels , so as to be perfectly level . The eye piece of the telescope is moved in or out until the hairs are seen distinctly ; and the object glass is adjusted to distinct vision , according to the distance of the levelling staff ...
Página 255
... inches long , but some are eighteen and others twenty inches long . They cost from 127. to 187. , and are so well balanced and secured that they will not require , with proper ROAD INSTRUMENTS AND TOOLS . 255 Spirit Levels.
... inches long , but some are eighteen and others twenty inches long . They cost from 127. to 187. , and are so well balanced and secured that they will not require , with proper ROAD INSTRUMENTS AND TOOLS . 255 Spirit Levels.
Outras edições - Ver tudo
A Treatise on Roads: Wherein the Principles on which Roads Should be Made ... Sir Henry Parnell Visualização integral - 1837 |
A Treatise on Roads: Wherein the Principles on which Roads Should be Made ... Sir Henry Parnell Visualização integral - 1833 |
A Treatise on Roads: Wherein the Principles on which Roads Should be Made ... Sir Henry Parnell Visualização integral - 1838 |
Palavras e frases frequentes
2d Edition abutments acclivity Allesley arch axle bottom breadth bridge broken stones built carriage centre cloth coach coating commissioners considerable constructed contractor Coventry cross drains depôts depth draught drawing earth eighteen inches elasticity embankments engineer Engravings expense experiments fences foot footpath formed Foster's Booth foundation four inches gravel half hard Hartshill hill hind Holyhead Road horizontal horses improvement inches deep inches thick inches wide J. C. LOUDON John Kershaw labour laid length line of road London masonry materials ment miles necessary nine inches North Wales paved pavement placed Plate posts principle proper quicksets Rates of Inclination repair road-making roadway side channels side springs six inches slopes spirit level Stowe Hill surface surveyor Telford Thomas Baylis three inches tractive TREATISE trustees turnpike roads turnpike trusts velocity Vignette Titles vols waggon weight wheels whole wing walls Woodcuts yards
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