Journal . ^Sfe ^ Diam: or Orifice M/M SettSZM 7-5 mm. 930 grs. sq. cm. The ratio of these diameters is — = 1 35, and the inverse ratio of the pressure is 930/830 = 112. The 12-4 mm. orifice needed a pressure of 635 cm. and the 10-1 mm. orifice 830 gr. sq. cm. The ratio of 102 THE PHYSICAL PROPERTIES OF CLAY. these diameters is 12-4/10-1 = 1-23, and the inverse ratio ofthe pressures is 830/635 = 1 -31. The curves have been exterpolated a short distance backto the ordinate representing no discharge, and the intersections T~Ti 7~ !~T~: i:1. 30IJIUO JO •VNVIQ with this ordinate indicate co
Journal . ^Sfe ^ Diam: or Orifice M/M SettSZM 7-5 mm. 930 grs. sq. cm. The ratio of these diameters is — = 1 35, and the inverse ratio of the pressure is 930/830 = 112. The 12-4 mm. orifice needed a pressure of 635 cm. and the 10-1 mm. orifice 830 gr. sq. cm. The ratio of 102 THE PHYSICAL PROPERTIES OF CLAY. these diameters is 12-4/10-1 = 1-23, and the inverse ratio ofthe pressures is 830/635 = 1 -31. The curves have been exterpolated a short distance backto the ordinate representing no discharge, and the intersections T~Ti 7~ !~T~: i:1. 30IJIUO JO •VNVIQ with this ordinate indicate considerable pressures before therewas any discharge. Plotting these initial pressures, whichwere necessary to cause the discharge to start, as ordinates andthe diameters of the orifices as abscissae, we obtain curve A ofSet XXVIII., which looks like an hyperbola. THE PHYSICAL PROPERTIES OF CLAY. 103 Similarly curve B of Set XXVIII. connects the criticalpressures of extrusion with the diameters of the orifices. Thisproves to be an hyperbola, its equation being pd °-833 = 5,408,where p is in grams per sq. cm., and d is in mm. Thus while the pressure of fluidity is independent of thediameter of the disc, the critical pressure of extrusion dependson the diameter of the orifice in the manner just stated. Set XXIX. brings out clearly the effect of an increase ofpressure on the rate of discharge per sq. cm. of area of the curves are easily deduced from those forming Set connect the diameter of the orifice (ordinates)
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Keywords: ., bookcentury1800, bookdecade186, bookpublisherlondon, bookyear1861
