DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.62828#0093
( 43 )
on that line. When therefore any degree above forty-five is
wanted, take the radius of the circle to be divided, and open
the fedor till the compafs legs touch 45 on the fecond tangent
line on each limb; then will the inftrument be prepared for
taking the tangent of any degree up to feventy-five, by pro-
ceeding in the fame manner as on the firft tangent line.
SECTION III.
On the Names and Properties of various ufeful Geometrical
Figures of the Superficies.
To have fome knowledge of the names of ufeful geome-
trical figures is certainly of advantage to every one, and efpe-
daily to fuch perfons as are concerned with drawing or making
pieces of work of the like forms.
It is certain from experience and matter of fad, that many,
not acquainted with names of this kind, are obliged to ufe a
dozen words and figns when one would be fufficient.
F 2 Befides,
on that line. When therefore any degree above forty-five is
wanted, take the radius of the circle to be divided, and open
the fedor till the compafs legs touch 45 on the fecond tangent
line on each limb; then will the inftrument be prepared for
taking the tangent of any degree up to feventy-five, by pro-
ceeding in the fame manner as on the firft tangent line.
SECTION III.
On the Names and Properties of various ufeful Geometrical
Figures of the Superficies.
To have fome knowledge of the names of ufeful geome-
trical figures is certainly of advantage to every one, and efpe-
daily to fuch perfons as are concerned with drawing or making
pieces of work of the like forms.
It is certain from experience and matter of fad, that many,
not acquainted with names of this kind, are obliged to ufe a
dozen words and figns when one would be fufficient.
F 2 Befides,