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Convection boundaries caused by small irregularities in the analytical ultracentrifuge cell are described and polishing of the sector walls is recommended. Accurate alignment of the cell in the rotor may be accomplished by a slot and pin arrangement without materially decreasing the strength of...
Stable self‐quenching counters may be prepared by filling counter tubes with tetramethyl lead vapor at about 2 cm pressure. The counters are characterized by wide usable voltage ranges and show wide voltage ranges where the count is practically independent of voltage.
Procedures are described which permit the use of an optical filter with sharp absorption bands to supplement emission line data in the laying out of a wave‐length cam for a recording spectrophotometer. The range 355 to 1200 mμ is covered in order to fulfill the need for obtaining...
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