I fis ] 
moves describe tbe ^rc f g and bringing the lirtib at 
Hglit angles to C. D- along its left edge draw the 
line d g ; with the radius d g lay off f g which di¬ 
vide into 60 degrees and, by straight lines drawn 
through them from d, transfer the graduations to 
the brass plates A a B, numbering them as on the 
draughte ■ ' ' 
To Use the insirmnenl, OVeit it aS represented 
on the draught, and by means of a couple of small 
bolts contrived for that purpose in the inside, secure 
it in this situation. Fasten on it a sheet of paper 
with some bees waK applied tb its corners, so as not 
to cover the graduations ; bring the end of the bevel 
in a line with B D pressing the edge of the part 
e d against C D, then turn the moveable limb till 
its inhered'ge cut the degree of the course to be pro¬ 
tracted, and fasten it by means of the screw at d, 
slide e d along C D or A B till the edge of the limb 
e d cut the poktt from which die course is to be 
laid. Observing to turn the one or the other side 
of the bevel up, according as the course is to b4 
drawn east or west of the meridian and draw either 
upwards or downwards along the limb according as 
the course is to the northward or southward Of the 
point from which it is to be laid off.—if the angle j 
of the Course to be protracted exceed 45 degrees | 
take its compliment and apply the bevel to the sido ' 
A C or B D and "proceed as before directed. If | 
more than one sheet is required to contain a survey, ! 
observe the directions in tliot case given for using I 
