[3.] In a sea-view, owing to the rotundity of the earth, the real horizontal line is slightly below the sea line, which is noted in Chapter I.
[4.] Some will tell us that Nature abhors a straight line, that all long straight lines in space appear curved, &c., owing to certain optical conditions; but this is not apparent in short straight lines, so if our drawing is small it would be wrong to curve them; if it is large, like a scene or diorama, the same optical condition which applies to the line in space would also apply to the line in the picture.
[INDEX]
Index citations in the original book referred to page numbers. Where possible, links will lead directly to a chapter header or illustration. Note that the last two entries for Toledo are figure numbers rather than pages; these have not been corrected.
A
Angles of Reflection, [259].