JF Ptak Science Books Quick Post History of Lines
These are particularly fine and relatively early printed images depicting a specific kind of line of sight--this one, a positioning, rather than a line of sight in fire control, or radial velocity, EM radiation or acoustics wave propagation, or targeting...this instrument was used to establish an imaginary line in perceived objects.
This is a detail from Andrew Wakley's The mariner's compass rectified : containing tables, shewing the true hour of the day, the sun being upon any point of the compass ; with the true time of the rising and setting of the sun and stars, and the points of the compass upon which they rise and set ... With the description and use of those instruments most in use in the art of navigation. Also a table of the latitudes and longitudes of places, published in 1763 and reprinted many times after that. (Full text is available from Google books and also from the Haithi Trust which offers a text version of the book as well.)
The full page from which the detail is drawn:
There is a certain continuum in developing sight lines that comes to mind, as with this famous image drawn by Leonardo in 1508, perhaps the first modern interpretation of how the eye functions, kept privately in manuscript, the result of theory and experimentation:
Which leads us to the sigh lines of Albrecht Durer, illustrating (some 17 years later) the use of a perspective tool, the vielo, in his work The Drawing Manual published in 1525: