INDUSTRTAL AND ENGISEERING CHEMISTRY
5 12
VOL. 10, NO. 9
TABLE XII. POWDER DIFFRACTION DATAFOR 1000 CHEMICAL SUBSTANCES (Concluded) (Starred patterns were checked with I/Il d 1/11 997. Zr(NOdr.5HzO 994. L C H ~ C I ~ ~ C H F 995. Zr* CHzC 0)zZn 2Rz0 2.78 (12.5) 0 . 3 1 9.6 (40) 1.00 2.56 12.5 (62.5) 1.00 (8) 0.20 6.9 (40) 1.00 2.44 (40) 1.00 7.2 0.03 6.1 0.05 1.88 0.18 6.3 0.06 5.2 0.10 1.61 0.18 4.73 (20) 0.50 5.5 0.10 4.85 (30) 0.48 1.460 4.21 0.18 0.18 4.55 (15) 0.24 1.360 0.15 3.64 0.20 1,343 3.49 0.15 0.10 4.25 0.08 3.25 0.38 1.282 0.05 3.78 0.24 1.220 0.03B 3.57 0.10 3.03 0.10 2.56 0.18 1,180 0.03B 3.10 0.08 2.43 0.15 1.082 0.05 2.98 0.03 2.87 0.02 2.33 0.15 1.038 0.08 2.70 2.17 0.15 0.06 1.003 0.03 0.977 0.03 2.13 0.15 2.57 0.05 2.07 0.13 2.48 0.02 0.898 0.03 1.98 0.13 2.35 0.877 0.03 0.06 1.91 0.08 2.30 0.03 1.81 2.24 0.02 0.10 996. ZrOClz.8HzO 2.19 0.03 1.74 0.08 2.12 0.03 12.8 (15) 1.00 1.70 0.05 10.6 0.27 2.07 0.06 1.64 0.10 7.9 0.20 2.02 0.05 1.59 0.03 6.9 (10) 0.67 1.96 0.05 1.55 0.05 4.80 0.13 1.88 1.51 0.03 0.06 4.12 0.27 1.476 0.03 1.81 0.03 3.82 0.20 1.390 0.03 1.76 0.03 3.60 (12.5) 0.83 1.360 0.05 1.69 0.05 3.24 0.40 1.295 1.60 0.03 0.03 2.96 0.07 1.490 0.03 1.228 0.03 2.74 0.07 2.55 0.07 2.39 0.07 2.22 0.13 2.15 0.20 2.07 0.13 2.00 0.07 1.91 0.13 1.81 0.13 1.71 0.13 1.62 0.13 1.57 0.07 1.51 0.07 1.460 0.07 1.423 0.07
d
ID1
d
published crystal structure data) d IlIi d IlIi 998. ZfO2* 999. ZrSiOa* (Monoclinic) 4.43 0.50 5.1 0.05 3.29 (100) 1.00 2.64 3.69 0.24 0.04 2.51 3.19 (125) 1.00 (100) 1.00 0.13 2.33 2.85 (100) 0.80 2.21 2.63 0.32 0.15 2.55 0.16 2.05 0.30 1.90 2.34 0.08 0.25 1.74 0.15 2.21 0.24 1.71 2.01 0.16 (75) 0.75 1.85 0.32 1.64 0.25 1.54 0.03 1.81 (50) 0.40 1.479 1.70 0.20 0.15 1.380 0.20 1.66 0.24 1.360 0.15 1.62 ' 0.05 1.285 1.59 0.06 0.06 1.55 0.24 1.255 0.20 1.210 1.51 0.08 0.02 1.185 1.486 0.16 0.18 1.163 1.426 0.16 0.03 1.098 1.363 0.05 0.15 1.057 1.330 0.08 0.08 1.046 0.13 1.307 0.03 0.999 1.270 0.12 0.04 1.219 0.05 0.10 0.972 1.167 0.06 1.113 0.06 1.036 0.04 1.001 0 06
d IlIl 1000. Zircongl Sulfate 6.5 (8) 0.40 4.92 0.20 4.35 (20) 1.00 3.47 0.25 2.98 (17.5) 0.88 2.90 0.10 2.70 0.05 2.51 0.05 2.33 0.30 2.13 0.15 1.98 0.20 1.89 0.10 1.82 0.05 1.77 0.10 1.72 0.05 1.69 0.08 1.64 0.10 1.59 0.10 1.52 0.05 1.460 0.05 1.392 0.05 1.358 0.05 1.280 0.05 1.250 0.05 1.090 0.05 1.053 0.05
A Compact Self-Regulating Valve L. WILLIAMS AND A. H. WILSOR' BUSBY Consolidated Mining & Smelting Company of Canada, Ltd., Trail, B. C.
I
/#LET STFADY f L 0 W
S C O S S E C T I O X with collecting air samples by nieans of an evacuated
chamber, a constant rate of flow of the sample was required as the vacuum in the chamber dropped. The controlling device had to be compact, light, and sufficiently strong to stand a lot of abuse. T h e volume of the chamber n-as approxiinately 1 cubic foot, and it 77 as desired to sample this volume in about 3 minutes. L/ARv,,,,8 The valve as illustrated was made from materials a t hand and performed well. A S o . 10 rubber stopper was cut out to leave a 0.19-inch nall and tn-o 0.063-inch brass plates were vulcanized over the open ends. I n the center of one plate was drilled a 0.047-inch orifice and a copper connecting tube TT as soldered on. I n the center of the other plate was soldered a 0.125-inch valve stem and packing gland. The original valve needle had been cut away and a smaller long needle set in its place. This end plate also contained the 0.25-inch vacuum connection. As the vacuuiii in chamber d varies, the end plates move accordingly and the orifice adjusts the flow to an approximately constant value. There is no friction ini-olved in the movement and the adjustment takes place without any time lag. K i t h the full vacuum applied, the needle n-as screwed in until the desired rate of flon. was attained, and it was found that the flow remained constant to within 10 per cent for a variation of vacuum from 28 down to 2 inches of mercury, belon which the flow fell off a t a rate depending on the friction in the sampling system. T h e steadiness of flow may be improved b y suitably shaping the point of the needle valve. B y a reverse arrangement of the needle, the valve may be adapted for governing air flow from a pressure source. The valve worked surprisingly well and can be refined and adapted to other purposes. RECEIYED4ugust 22, 1938
