. Elementary and dental radiography / by Howard Riley Raper . Fig. 4 7. X-ray tube properly lit Fig. 48. X-ray tube with the current passing through it in the wrong direction. fifty billion per second. The intermediate colors—blue, green, yellow andorange—vibrate at intermediate degrees of rapidity. Though human vision is limited to about three hundred and fiftybillion variance, the difference between four hundred billion and sevenhundred and fifty billion, may we not fairly assume that there are light X-RAY TUBES AND THE X-RAYS 51 ravs of a higher and lower vibration invisible to us? Ult
. Elementary and dental radiography / by Howard Riley Raper . Fig. 4 7. X-ray tube properly lit Fig. 48. X-ray tube with the current passing through it in the wrong direction. fifty billion per second. The intermediate colors—blue, green, yellow andorange—vibrate at intermediate degrees of rapidity. Though human vision is limited to about three hundred and fiftybillion variance, the difference between four hundred billion and sevenhundred and fifty billion, may we not fairly assume that there are light X-RAY TUBES AND THE X-RAYS 51 ravs of a higher and lower vibration invisible to us? Ultra-violet rayshave a more rapid vibration than violet rays, and have no action on theretina, and are therefore invisible. X-rays vibrate more rapidly thanultra-violet rays. The rapidity of their vibration is estimated at 288,,* (two hundred and eighty-eight quadrillions, twohundred and twenty-four trillions—French notation) per second.
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