An Account of the Operations Carried Out for Accomplishing a Trigonometrical Survey of England and Wales: From the Commencement, in the Year 1784, to the End of the Year 1796, Begun Under the Direction of Royal Society, and Continued by Order of the Honourable Board of Ordance ; First Published In, and Revised From, the Philosophical Transactions, Volume 2W. Bulmer and Company, 1801 |
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Page 26
... microscopes fixed to it ; the former ones being much inferior , in construction , to those attached to the instru- ment belonging to Government . To carry on so extensive a survey as that which is now the subject of this Paper , much ...
... microscopes fixed to it ; the former ones being much inferior , in construction , to those attached to the instru- ment belonging to Government . To carry on so extensive a survey as that which is now the subject of this Paper , much ...
Page xv
... microscopic pyrometer for determining the ex- pansion of the metals concerned in the measurement Account of the experiments with the pyrometer Ultimate determination of the length of the base Height of the base above the sea Table of ...
... microscopic pyrometer for determining the ex- pansion of the metals concerned in the measurement Account of the experiments with the pyrometer Ultimate determination of the length of the base Height of the base above the sea Table of ...
Page xx
... Microscopes and eye - pieces Articles of machinery used in the operation in 1787 , 1788 Positions of the stations on the tops of towers , & c . Plan of the triangles connecting the meridians of Greenwich and Paris Geometrical diagrams ...
... Microscopes and eye - pieces Articles of machinery used in the operation in 1787 , 1788 Positions of the stations on the tops of towers , & c . Plan of the triangles connecting the meridians of Greenwich and Paris Geometrical diagrams ...
Page 69
... Microscopic Pyrometer , made use of for determin- ing , by experiment , the Expansion of the Metals concerned in the Measurement of the Base . Pl . V. 15. Having , in the preceding part of this Account , given a very minute detail of ...
... Microscopic Pyrometer , made use of for determin- ing , by experiment , the Expansion of the Metals concerned in the Measurement of the Base . Pl . V. 15. Having , in the preceding part of this Account , given a very minute detail of ...
Page 70
... microscopic pyrometer , so named , because by means of two microscopes attached to it , the expansion is measured , consists of a strong deal frame , five feet in length , nearly twenty - eight inches broad , and about forty - two ...
... microscopic pyrometer , so named , because by means of two microscopes attached to it , the expansion is measured , consists of a strong deal frame , five feet in length , nearly twenty - eight inches broad , and about forty - two ...
Contents
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Common terms and phrases
Allington Knoll Angles corrected Angles observed Ann's Hill Arbury Hill axis Banstead base Beachy Head Beacon Hill Black Botley Hill Bow Brickhill Bradley Knoll brass Brill Bull Barrow Butser Hill Butterton Carraton Hill Castle chain Chanctonbury Ring Church computed Crowborough Beacon deal rods Dean Hill degree depr distance Ditchling Beacon Dover Dumpdon Dundry Dunnose elev Epwell Fairlight feet Flagstaff glass rods Goudhurst ground Hampton Poorhouse Hanger Hill Hensbarrow Beacon Highclere Hind Head Hounslow Heath hypothenuses inches instrument intersected objects Karnbonellis Karnminnis King's Arbour Kinsworth Kit Hill Lansallos Leith Hill length Lidlington Light-house Maker Heights means measurement Mendip Meridian of Greenwich micrometer Moor Lynch Motteston Names of stations Nine Barrow Observed angles operation perpendicular Pertinney pickets Pilsden placed refraction Rippin Tor Rook's Hill screws Severndroog Castle Severndroog Tower Shooter's Hill side Spire staff Steeple telescope Tenterden triangles Waldershare Wendover White Horse Hill Windmill Wingreen wire
Popular passages
Page 2 - ... having been carried out with instruments of the common, or even inferior kind, and the sum allowed for it being inadequate to the execution of so great a design in the best manner, it is rather to be considered as a magnificent military sketch, than a very accurate map of a country...
Page 1 - Accurate surveys of a country are universally admitted to be works of great public utility, as affording the surest foundation for almost every kind of internal improvement in time of peace, and the best means of forming judicious plans of defence against the invasions of an enemy in time of war ; in which last circumstance, their importance usually becomes the most apparent.
Page 3 - on the conclusion of the peace of 1763 it came for the first time under the consideration of Government to make a general survey of the whole island at public cost...
Page 175 - BA, the sum of the two refractions ; hence, supposing half that sum to be the true refraction, we have the following rule when the objects are reciprocally depressed. Subtract the sum of the two depressions from the contained arc, and half the remainder is the mean refraction : — If one of the points B, instead of being depressed be elevated, suppose to the point g, the angle of elevation being gA.D, then * " Trigonometrical Survey,
Page 89 - An account of the trigonometrical operation, whereby the distance between the meridians of the Royal Observatories of Greenwich and Paris has been determined.
Page 2 - The rise and progress of the rebellion which broke out in the Highlands of Scotland in 1745, and which was finally suppressed by His Royal Highness the Duke of Cumberland at the battle of Culloden in the following year, convinced the Government of what infinite importance it would be to the State that a country, so very inaccessible by nature, should be thoroughly explored and laid open, by establishing military posts in its inmost recesses, and carrying roads of communication to its remoter parts.
Page 101 - Head ; and the length of a degree of a great circle, perpendicular to the meridian, in latitude 50° 41 . Section VI.
Page 2 - Assistant-Quarter-Master, it fell to my lot to begin, and afterwards to have a considerable share in, the execution of that map ; which being undertaken under the auspices of the Duke of Cumberland, and meant at first to be confined to the Highlands only, was nevertheless at last extended to the Lowlands...
Page xiii - An Account of the Measurement of an Arc of the Meridian, extending from Dunnose, in the Isle of Wight, Latitude 50° 37
Page 4 - ... of the most remarkable steeples, and other places, in and about the Capital, with regard to each other, and the Royal Observatory at Greenwich.