Journal Royal Society ofN. S. W , Vol. XL V., 1911. Plate XII. 



RECORDING PEN 



APERTURE PLATE 



DISCHARGE HOLES 



OAUGE GLASS 



PAPER DRUM 



RECORDING DRUM 



ZERO-LINE PEN 



CLOCK GEAR 



AIR INLET 



THE AUTOGRAPHIC AIR-FLOW RECORDER. 



