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
... level , and to send the staff back to the point originally occupied by the theodolite . The vane having been previously adjusted to the exact height of the centre of the telescope , the head of the instrument is then ... Spirit Levels -
... level , and to send the staff back to the point originally occupied by the theodolite . The vane having been previously adjusted to the exact height of the centre of the telescope , the head of the instrument is then ... Spirit Levels -
Índice
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295 | |
100 | |
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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 - 1838 |
A Treatise on Roads: Wherein the Principles on which Roads Should be Made ... Sir Henry Parnell Visualização integral - 1833 |
Palavras e frases frequentes
Allesley arch Archway Road axles bottom breadth brick bridge broken stones built carriage centre coach coating commissioners constructed contract contractor Coventry cross drains DAVIES GILBERT depôts depth draught dynamometer earth eighteen inches elasticity embankments engineer expense experiments feet wide fences foot footpath fore wheels formed foundation four inches friction gravel ground half hard Hartshill height hill hind wheels Holyhead Road horizontal horses improvement inches deep inches thick inches wide instrument John Kershaw John Macneill labour laid length line of road manner masonry ment miles mortar mound necessary nine inches paved pavement placed Plate VII proper quicksets rails rates of inclination repair road-making roadway ruts side channels side springs six inches slopes specification spirit level springs square streets surface surveyor Telford theodolite Thomas Baylis three feet three inches trustees turnpike roads turnpike trusts upper velocity waggon whole wing walls
Passagens conhecidas
Página 20 - They will here meet with rutts which I actually measured four feet deep, and floating with mud only from a wet summer; what therefore must it be after a winter?