. Alloys of tungsten by diffusion. Z o -X. s- O r 0/ > +- SG r= 40 c bo £ 2 o § — -C =5 ^ 2 — ; C oo — s o —. y v — = N 4it a oould then be forced rapidly through the furnace, sweeping outall air very efficiently. After the air had been driven cut ofthe furnace, the hydrogen was allowed to flow directly from thegenerators, through alkaline pyrogallol, to the furnace, Thisflow was sufficient to maintain a reducing atmosphere in thetube. The porcelain tube was surrounded by one of alundum whichcarried the heating unit. During the first part of the work, thisunit was a platinum ribbon resistan
. Alloys of tungsten by diffusion. Z o -X. s- O r 0/ > +- SG r= 40 c bo £ 2 o § — -C =5 ^ 2 — ; C oo — s o —. y v — = N 4it a oould then be forced rapidly through the furnace, sweeping outall air very efficiently. After the air had been driven cut ofthe furnace, the hydrogen was allowed to flow directly from thegenerators, through alkaline pyrogallol, to the furnace, Thisflow was sufficient to maintain a reducing atmosphere in thetube. The porcelain tube was surrounded by one of alundum whichcarried the heating unit. During the first part of the work, thisunit was a platinum ribbon resistance winding, using about per hour at 1100° C. This was later replaced by a wind-ing of No. 14 B. and S. gage Chromel wire, which used about per hour at 1200° G. The heating unit was surroundedby a jacket of magnesia and asbestos. The temperature v/as controlled by the use of a platinum-platinum lCffo rhodium thermocouple, accurately calibrated in con-nection with a Siemens-Halske millivoltmeter. No attempt at con-trol closer than 5° C. was made, since very accurate temperaturec
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttheses, bookyear1920
