THE Reader is particularly requested to observe that, in the following Work, the MILE is the Nautical or Geographical Mile, corresponding to one minute of the Equator, of which Sixty are one Degree, equal to about sixty-nine miles and one third part, of English Statute Measure; That the LEAGUE contains three Maritime or Nautical Miles, twenty Leagues being one Degree; The Fathom adopted in this work has been the English, with the exception only of those in the Charts of Ferrol and Coruña, where the Spanish Fathom has been used, which, like the English Fathom, contains six feet; but as the standard Foot of Spain is somewhat shorter than the English Foot, the difference between the Spanish and the English Fathom comes to be considerable. According to the latest and most accurate comparisons of the lineal measures of Spain and England, it has been ascertained that the Spanish Foot contains 10,983 English Inches, and that the English Foot contains 13,11096 Spanish Inches. Hence the Spanish Vara or Yard of three feet, will contain 32,95 English Inches, and the Braza or Fathom, equal to two Varas or six Feet, will contain only five Feet, 5,9 Inches English, while the English Fathom will contain six Feet, 6,66 Inches Spanish; or in round numbers 12 Spanish Fathoms, Feet, or other Measures, are about equal to 11 English.—But more correctly-From the Logarithm of any given number of Spanish Fathoms, &c. subtract the constant Logarithm 0384544, and the remainder will be the Logarithm of the corresponding number of English Fathoms, &c.-Again, to the Logarithm of any number of English Fathoms, &c. add the same constant Logarithm, and the sum will be the Logarithm of the corresponding number of Spanish Fathoms, &c. The Longitude is calculated, and inserted in the Work, from the Meridian of the Royal Marine Observatory, situated in the South-east part of the town of CADIZ, towards the Land Front, and in Longitude West from the Meridian of the Royal Observatory at GREENWICH Six Degrees seventeen Minutes. London, 25th March, 1807. JOHN DOUGALL. Description of the Coast between CAPE PRIOR, and the Mouth of the Description of the Harbour of Ferrol, Description of the Bays of Ares and Betanzos, Description of the Bay and Habours of Corme and Laxe, Harbour of Camello-Cape Villano, Description of the Bay of Corcubion, Entry of the Bay and Haven of Corcubion, Description of the Cies, or Bayona Islands, Description of the Bay of Vigo, Anchorage eastward of the Points Bestias, and Randa, Harbour of Bayona-Cape Silleyro, River Minho, Miño, or Minio, page 91 92 Pederneyra Bay-Haven of Selir-Cape Carboeyro, Description of the Berlingas or Borlings, Cape Rocca-Point Sanget-Cascaes Bay, Bar of Lisbon-North and South Cachops, Directions for entering the River Tagus by both Channels, SECT. IV. b |