bullet nose can be constructed as follows:
Given a hyperbola H, intersects
every tangent with both x- and y-axis, giving points A and B respectively. Draw a line l through A
parallel to the y-axis and a line m through B parallel to the x-axis. Then
the intersection of lines l and m forms a point of the bullet nose.
The definition is a variation
on the definition of the cross
It was Schoute (1885) who first described the curve.