(Click TWICE to Enlarge.) It is fairly easy to at least imagine Horace’s motivation for pulling over on this country road to record the line of gravel as a repeat of the line streaming above him.   The curve of the dirt road follows that of the vapor.  In the post-war years Spokane had two military airports west of town, Geiger Field and Fairchild Air Force Base.  The latter was  soon sending hybrid B-36s droning over the city.  Extremely ponderous these over-sized flying tanks were retired early, made obsolete by the B-52, a serious cold war bomber.  I no longer remember what sort of marks these jets were leaving in the sky in the 1940s, so this vapor trail does not lead me to its maker.   I remember the fascination of them though.  In the summer it was something to lie in the grass and watch their creation.  The tail gave a substance to the airplane it did not have without it.