The nucleation of the uncontaminated atmosphere . omparison is given at the end of thework, in which N= 76,000 falls off to N— 32,000 for 6 plates, or athickness of about cm. (curve 81). An interesting comparison is given for the efficiency of the X-raytube radiating from this distance either from the front face of the anti-cathode or from the rear face of the anticathode, the tube in the lattercase being completely reversed (curve 80). The mean results arerespectively iV=42,500 and iV= 34,600, showing the anticathode tobehave as if it were transparent or at least radiating from bothfaces
The nucleation of the uncontaminated atmosphere . omparison is given at the end of thework, in which N= 76,000 falls off to N— 32,000 for 6 plates, or athickness of about cm. (curve 81). An interesting comparison is given for the efficiency of the X-raytube radiating from this distance either from the front face of the anti-cathode or from the rear face of the anticathode, the tube in the lattercase being completely reversed (curve 80). The mean results arerespectively iV=42,500 and iV= 34,600, showing the anticathode tobehave as if it were transparent or at least radiating from bothfaces in all directions. Indeed, even if the anode and the cathode areexchanged (reversed current), considerable radiation is sent out; as, for instance, Concave mirror the cathode, N=47,000,Concave mirror the anode, JV= 7,000, or about 16 per cent of the nucleation has been retained (curve 80).The coronas obtained when lead screens are used in front of the fogchamber are clear and often multi-annular, showing the nuclei to bevery nearly of a •a -8 to /* h- i-e Figs. 79-82.—Illustrating table the above chart Tab. 20 — present table 47. PENETRATION OF X-RAYS. 77 Table 47.—Penetration of rays and reversal of tube; 8^ = 25 cm. Exposure about3 sec. prior to condensation without cutting off the radiation; air, s= ; woodfog chamber not cased (fig. 41). Part. D. Sl s2. WiXio-3. ^Xio-3. Remarks on penetration. I. 200 5-45-4 3-2 83-483-4 Screens removed. Tin plate, mm. thick. 4-3 (*) Lead plate, mm. thick. 4-5 Lead plate, mm. thick. 4-5 Lead plate, mm. thick. 5-4 83-4 Screen removed. II1. 600 74-4 Do. 3-9 r Lead plate, mm. thick. 600 r Screen removed. Tube reversed. 4-3 r Screen removed. Tube directed. 3-9 r Screen removed. Tube reversed. •y Screen removed. Tube directed. 600 Anodal II. 600 *3-7 § r
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherwashi, bookyear1906
