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The Method of. working a Traverfe. 
Lat. 46° 48’ N. Long. 7° 47’ W. failed from, 
Courfes. Diftances. 
S.5. W. 3 W.) - 24 miles 
S.bW. - - ee 
Sade - - 40 
required the latitude and longitude arrived at, together with the 
direG courfe and diftance. 
Ser the femicircle to the proper latitude departed from 
46° 48’, and the index to the courfe S.S. W. 3 W.; mark the 
diftance 24 on the index, and bring the perpendicular to meet 
it, then the index will cut the departure 11.3 on the perpen- 
dicular, and the perpendicular will cut the latitude 46° 27’ N. 
on the bafe. For the next cafe, bring the femicircle to the 
latitude marked by the perpendicular 46° 27’, and lay down 
the courfe S. b W.; if it be towards the firft meridian, move 
the laft marked departure until it meets the index, and the 
limb of the box will mark the prefent departure; but if the 
courfe be from the firft meridian, bring the laft departure 11.3 
to the limb of the box, and the index will mark the departure 
made good 18.3 on the perpendicular, and the latitude arrived 
at 45° 52’ will be marked on the bafe by the perpendicular ; 
proceed in the fame manner with all the cafes of which the 
traverfe confifts, then the difference of latitude 11° 36’ will be 
intercepted between the latitude failed from 46° 48’ and the lati- 
tude 
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