[ 5 1 7 ] 
of thin Brafs, the Edge whereof is turned down 
at right Angles to the Plane of the Cardto make 
it more ftiff. 
O is a catgut Line drawn down the Infide of the Box } 
for determining the Degree upon the brafs Edge. 
F&RS is the Index Bar, with its two Stiles and 
Catgut Threads j which being taken off from the 
Top of the Box, is placed in two Pieces, T and 
notched properly to receive it. 
IV is a Place cut out in the Wood, ferving as an 
Handle. 
Fig . 2. is the Card in piano with the Needle fixed 
upon it; being one Third of the Diameter of the 
real Card. 
Fig. 3. is a perfpe&ive View of the Backfide of the 
Card, where 
AB reprefents the turning down of the brafs Edge.. 
C is the under Part of the Ivory Cap. 
F> and E are the two Aiding Weights to balance the 
Card ; and 
F and G, two Screws that fix the brafs Edge, &c. 
to the Needle. 
Fig. 4. is the Pedeftal that fupports the Card, con- 
tained a fowing Needle, fixing in two fmall 
Grooves to receive it, by means of the Collet C t 
in the manner of a Port-Creyon. At D the Stem 
is filed into an Odagon, that it may be the more 
eafily unferew’d. 
U u u 2 
XX. 
