xlii 
APPENDIX. 
OBSERVATIONS ON ROAD MEASUREMENTS DEDUCED FROM THE 
ORDINARY WALKING PACE OF HORSES AND CAMELS. 
Independent of the operations for laying down the coast, an 
account of the various windings of the road travelled by the camels 
was regularly kept by Lieutenant CoflRn as far as Bengazi. 
This was done by observing the direction of their route by com- 
pass, and noticing the time they were on the road ; proper deduc- 
tions being made for stoppages, &c. At the end of each day the 
courses and distances were collected into a traverse-table, and the 
latitude and longitude deduced therefrom, as is usual with the D.R, 
on board ships at sea. If the latitude by these means diflFered from 
the observation, a proper correction for error in course, distance, or 
both was made, and the result noted accordingly. 
A more favourable opportunity of proving the dependance that 
may be placed on such a reckoning on land, could not, in all proba- 
bility, have offered itself ; as the extent of each day’s progress was 
accurately determined by the means adopted for carrying on the 
survey. And it may be useful to future travellers, as well as to 
those persons who may have to compile maps from camel journeys, 
to insert an abstract of the different days’ works, compared with the 
latitude and longitude by observations, which will be found annexed. 
By this Table it will be seen that the average rate of travelling has 
not exceeded two miles and ahalf per hour, and that at the end of the 
journey from Mesurata to Bengazi, a distance of four hundred and 
twenty-two miles, there is only a difference of 9' in the longitudes. 
This is an error so small, that there are few persons who would object 
to the accuracy of the places laid down by the means employed, and 
yet there are many who would feel inclined to dispute the accuracy of 
the average rate. But the truth is that, in travelling through coun- 
