ELUCIDATIONS. 
219 
For a caravan journey, taken at twenty-tv/o Britifh miles of road 
diilance, will produce, when the allowance for v/inding is de- 
duced, and the remainder reduced to geographic miles, about 
fixteen and a half fuch miles for a fnigle day. 
The following are the proportions v/hich I have eftablifhed, 
for the application of a fcale, to the diiferent degrees of dif- 
tance, 
Por one day, fixteen miles and a half; for feventeen to twen-= 
ty-flve days, fifteen miles ; for forty to fifty days, thirteen miles. 
Thefe numbers are particularly fele£led, becaufe they occurred 
in the courfe of the Work. The Reader will be pleafed to ob- 
ferve, that the miles fpoken of in the conftruftion, are always 
thofe of fixty to a degree of a great circle. However tedious 
this invefligation may appear to the generality of readers, it is 
abfolutely neceffary; as it is the hinge upon which the whole 
turns : and a negleft of attention to this particular fubjed, would 
warrant the Reader's taking the whole for granted, without fur- 
ther examination. 
Mr. Beaufoy having given, from the materials in his poffef- 
£on, fo full an account of each road and country, nothing re- 
F f 2 mains 
