<P> The figure on the left displays drawings that attempt to show the general forms of various alidades that can be found on many antique instruments . Real alidades of these types could be much more decorative , revealing the maker 's artistic talents as well as his technical skills . In the terminology of the time , the edge of an alidade at which one reads a scale or draws a line is called a fiducial edge . </P>
<P> The figure on the left displays drawings that attempt to show the general forms of various alidades that can be found on many antique instruments . Real alidades of these types could be much more decorative , revealing the maker 's artistic talents as well as his technical skills . In the terminology of the time , the edge of an alidade at which one reads a scale or draws a line is called a fiducial edge . </P>
working edge of an alidate is known as
working edge of an alidate is known as
fiducial edge
fiducial edge