The Collaborative International Dictionary of English v.0.48:

Phantasmascope \Phan*tas"ma*scope\, n.
   See Phantascope.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Phantascope \Phan"ta*scope\ (f[a^]n"t[.a]*sk[=o]p), n. [Gr.
   fa`ntasma image + -scope.]
   An optical instrument or toy, resembling the phenakistoscope,
   and illustrating the same principle; -- called also
   phantasmascope.
   [1913 Webster]