RAY BOX METAL
\nPHY-00584 \nHoused in a case, with straight filament lamp. The lamp holder is mounted in sliding metal bridge piece which provides sufficient adjustment to covering, parallel or diverging rays. The enameled steel body has slots to support a cylindrical lens & a triple slit screen. Extra slots are provided for filters. The box is supplied complete with lens& triple slit. \n \n
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