VESSELS MADE FROM QUARTZ AND SOME OF THEIR USES BY PROF. JOHN TROWBRIDGE. AN HYGIENIC STREET-SWEEPING MACHINE. A MECHANICAL STREET CLEANER. Fig. 1NEEDLE-LIKE PIECES OF AMORPHOUS SILICA AND THE TUBES BUILT UP FROM THEM. Fig. 2SPECTRUM TUBES MADE FROM AMOR PHOUS SILICA., scientific american, 1903-03-28
VESSELS MADE FROM QUARTZ AND SOME OF THEIR USES BY PROF. JOHN TROWBRIDGE. AN HYGIENIC STREET-SWEEPING MACHINE. A MECHANICAL STREET CLEANER. Fig. 1NEEDLE-LIKE PIECES OF AMORPHOUS SILICA AND THE TUBES BUILT UP FROM THEM. Fig. 2SPECTRUM TUBES MADE FROM AMOR PHOUS SILICA., scientific american, 1903-03-28
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