Page Situations of the stations TRIGONOMETRICAL SURVEY, 1795, 1796. Principal angles observed in 1795 Iron cannon inserted at the extremities of the base on Salisbury Principal angles observed in 1796 Calculation of the sides of the principal triangles, extending to the Land's End Observed elevations and depressions Terrestrial refractions: and heights of the stations Height of the station on Maker Heights found by levelling 360 862 365 870 372 377 383 Situation of the Eddystone Light-house determined of the Lizard Light-houses 403 of the Scilly Light-house, and other objects in the Scilly 411, 418, 421, 423 Principal and secondary triangles Bearings and distances from the meridian of Greenwich and its perpendicular Latitudes and longitudes of the intersected objects in Kent 4.12 to 427 PLATES. Plan shewing the situation of the base on Hounslow Heath Steel chain Deal rods XII. XIII. Glass rods Pyrometer Apparatus for the measurement on Romney Marsh Plan shewing the situation of the base on Romney Marsh Plan and two sections of ditto Various parts of ditto Microscopes and eye-pieces Articles of machinery used in the operation in 1787, 1788 Plan of the triangles connecting the meridians of Greenwich and Geometrical diagrams For improving the map of London, &c. Transit instrument Plank and bar used in measuring the chains XIV. XV. XIX. Handle of the chain. And geometrical diagrams Plan of the principal triangles in the Trig. Survey, 1791–1794 xx. in the Trig. Survey, 1795, 1796 xxi. Part of Kent and Sussex XXII. AN ACCOUNT, &c. INTRODUCTION. 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 circumstances their importance usually becomes the most apparent. Hence it happens, that if a country has not actually been surveyed, or is but little known, a state of warfare generally produces the first improvements in its geography: for in the various movements of armies in the field, especially if the theatre of war be extensive, each individual officer has repeated opportunities of contributing, according to his situation, more or less towards its perfection; and these observations being ultimately collected, a map is sent forth' into the world, considerably improved indeed, but which, being still defective, points out the necessity of something more accurate being undertaken, when times and circumstances may favour the design. 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 late Duke of Cumberland, at the battle B |