. American X-ray journal . Fig. 48. — Showing Seehear in Use. this note sooner than was intended togive it place. NOTE LII — LIGHT GASES. There are present in the air gases incomparison with which hydrogen is 598 THE AMERICAN X-RAY JOURNAL. heavy. A scientific man would notmake this statement on the evidence Ipossess, but as such things are with meonly what a poet has called considera-tions by the way, I do not hesitate. Since Roentgens discovery was an-nounced I have had tubes under obser-. Fio. 49.—Showing Girdle. vation for a great number of hours,because having constructed an apparatuswhic
. American X-ray journal . Fig. 48. — Showing Seehear in Use. this note sooner than was intended togive it place. NOTE LII — LIGHT GASES. There are present in the air gases incomparison with which hydrogen is 598 THE AMERICAN X-RAY JOURNAL. heavy. A scientific man would notmake this statement on the evidence Ipossess, but as such things are with meonly what a poet has called considera-tions by the way, I do not hesitate. Since Roentgens discovery was an-nounced I have had tubes under obser-. Fio. 49.—Showing Girdle. vation for a great number of hours,because having constructed an apparatuswhich runs continuously without eithernoise or attention for an/ length of time,I have usually had a tube excited allday for many days in succession, in or-der that I might, during the intervals of work, glance atit to see if there was any-thing new to think a result I imagine thereis a period of maximum effi-ciency to which an ordinarytube never after attains untilit is again opened to the airand repumped. When thevacuum gets too high it isa simple matter to lower itwith cither my oxygen orhydrogen regenerators sothat the tube may be run in-definitely without repumping, but we donot restore the pristine brilliancy whichhas gone, as Omar would say—with therose of I explain this per-haps vain imagining by saying there areunknown gases of ex-reme lightness. I am aware that Crookes considers Brushsetherion to be only water vapor, butperhaps this may only show either
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