Glass lantern slide in a rectangular wooden frame. The front of the rectangular wooden frame is incised “T.H. MC ALLISTER / OPTICIAN N.Y.” A paper label on one edge reads “18. Coincidence of Spectrum of Iron with 65 of the Fraunhofer lines.”
Glass lantern slide in a rectangular wooden frame. The front of the rectangular wooden frame is incised “T.H. MC ALLISTER / OPTICIAN N.Y.” A paper label on one edge reads “18. Coincidence of Spectrum of Iron with 65 of the Fraunhofer lines.”