Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 218
uses of both, let the beam which rests upon inclined but par- tially flexible suppoits be gradually length- F ened in E. The blue is now less character- istically a strut, but the dark line still sur- rounds it. Only, however, on the side to- wards the middle of the beam is it plainly marked, and…
Engineering
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
