photonephograph

from The Collaborative International Dictionary of English v.0.48

Photonephograph \Pho`to*neph"o*graph\
   (f[=o]`t[-o]*n[e^]f"[-o]*gr[.a]f), n. [Photo- + Gr. ne`fos a
   cloud + -graph.] (Meteor.)
   A nephoscope registering by photography, commonly consisting
   of a pair of cameras used simultaneously.
   [Webster 1913 Suppl.]