細節
A lacquered brass adjustable micro-spectrograph signed W.Watson & Sons London with side mounted mirror reflector, rack-and-pinion adjustment in fitted mahogany case -*¾in.(22.5cm)wide; another lacquered brass spectroscopic attachment in fitted case signed G. & S. Merz in Munchen, with accessories; Norberts Test plate in red leather case; Webbs Lords Prayer microphotograph