The Thermal Conductivity of Air . Con. i I5 00O W 5 Dial PotentV * Fig. 3.—Diagram of thermo-junction circuits. Points with the same letters areconnected, , At to Av Con = constantan. Cu = copper. corresponding plain and suffixed letters (, C, Ci) were so attached to theswitch that they could be simultaneously connected to the potentiometerterminals. Measurements. Accuracy Required.—The accuracy required in measuring each quantityentering into the expression for k in order that k shall be correct to 1 in 500,is readily found from the relation, e2R,/r2J = kS (p2-0x)/x + R + C dd/dt + L.

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The Thermal Conductivity of Air . Con. i I5 00O W 5 Dial PotentV * Fig. 3.—Diagram of thermo-junction circuits. Points with the same letters areconnected, , At to Av Con = constantan. Cu = copper. corresponding plain and suffixed letters (, C, Ci) were so attached to theswitch that they could be simultaneously connected to the potentiometerterminals. Measurements. Accuracy Required.—The accuracy required in measuring each quantityentering into the expression for k in order that k shall be correct to 1 in 500,is readily found from the relation, e2R,/r2J = kS (p2-0x)/x + R + C dd/dt + L. The resistances E and r} and the electrical pressure e9 applied to r arereadily measured to 1 in 1000. S = 7r(dl2 + d22)/8> The Thermal Conductivity of Air. 197 where d\ and d2 are the diameters of the guard-ring and middle plate. Toattain the accuracy mentioned, d± and d2 are required to be known to002 cm. The average distance between the middle and lower plates, x, isrequired to 0*001 cm. The radiation B forms 4 per cent, o

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectproceed, bookyear1919