. American X-ray journal . dergone partial investigation at the hands ofsome illustrious radiologists. ist. To determine the mechanic valuem which corresponds to the discharge ofthe secondary current according to thedimensions (length and depth) of thespark, created by the said discharge. 2d. To calculate the relation betweenthis mechanic value m and the penetra-tion of the x-rays produced by the dis-charge to which this value corresponds. 3d. And further to find the analogybetween the mechanic value m and theintensity of the x-rays obtained by thisvalue. 4th. In a given coil to determine what
. American X-ray journal . dergone partial investigation at the hands ofsome illustrious radiologists. ist. To determine the mechanic valuem which corresponds to the discharge ofthe secondary current according to thedimensions (length and depth) of thespark, created by the said discharge. 2d. To calculate the relation betweenthis mechanic value m and the penetra-tion of the x-rays produced by the dis-charge to which this value corresponds. 3d. And further to find the analogybetween the mechanic value m and theintensity of the x-rays obtained by thisvalue. 4th. In a given coil to determine whatrelation there exists between the volumeof the discharge from the opening inthe secondary, and the intensity of theprimary current. 5. To determine the relation betweenthe volume of the discharge and the vol-tage of the current, which flows in theprimary circuit. 6. To determine the relation between The Kinraide High-Frequency Coil. The bestapparatusfor usewith thedirect oralternatingcurrent. SEND FOR DESCRIPTIVE EX B. Meyrowitz, Maker of Ophthalmological Apparatus. Complete Standard Electro-Therapeutic Equipments. X-Ray Apparatus and High Grade Eye, Ear, Nose and Throat East Twenty-third Street, ) 604 Nicollet Avenue, Minneapolis. 125 West Forty-second Street. -NEW YORK, 360 St. Peter Street, St. Paul. 650 Madison Avenue, J > 3 rue Scribe, Paris, France. 1002 THE AMERICAiV X-RAY JOURNAL. the same volume and the electric ca-pacity of the primary, including the con-denser. 7, 8 and 9. To solve questions similarto those marked 4, 5 and 6, except thatinstead of relating to the volume of theelectric discharges, refer to their poten-tial, estimated by the length of the spark. 10. To vertify the influence of thelength of time, the current circulates inthe primary upon each of the variouselements of the phenomena, that thiscurrent produces at the time of opening. To facilitate the solving of the abovementioned problem, it would be well tostudy the followi
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