107 
(the pen approximately at the same inclination) is much 
less than that of drawing the divisions through the plotted 
points, judging by the eye. 
If only one scale be required on the map, place the edge 
of the scale S near to the line KK. If two are required, 
place the edge of SS half-way between KK, K'K' to lessen 
the errors due to imperfections in the straight edge of the 
T-square. 
Construction of a Vernier Scale for the above Maj) Scale, 
The drawing board, T-square, set-square, and paper as in 
Fig. 2. 00 a strip of paper, on which the vernier scale is 
to be constructed, its edge being parallel to TT, the scale SS 
is attached to the edge of the set-square and slides with it, by 
means of the pins and elastic NN as before, but inclined to 
the edge of TT at an angle a = sec.~^ H ; it is kept in this 
position by the pegs IT, U in the end of the scale ; the fine 
ink line LL is drawn at right angles to SS, the lens being 
used on a stand as before, with its axis always in a vertical 
plane through LL. 
The divisions on the vernier scale will be 1 millimetres 
in length. 
“ Evidence to prove that a Bone from the Windy Knoll, 
Castleton, named by Professor W. Boyd Dawkins, F.B.S., 
