. American X-ray journal . e down upon the film side of the sen-sitive plate. The vacuum of Crookestube is constanly changing quantity andshould not be relied on to remain con-stant ; it differs in different tubes andsometimes in one and the same therefore have always to watch ourtube. To know our tube, the resistanceof the same, and the proper techniqueis the whole secret of good results inradiology. The discovery of Roentgen,which makes possible and easy an abso-lutely correct diagnosis where previously uncertainty and error outweigheddefinite knowledge, through this resultsin experi
. American X-ray journal . e down upon the film side of the sen-sitive plate. The vacuum of Crookestube is constanly changing quantity andshould not be relied on to remain con-stant ; it differs in different tubes andsometimes in one and the same therefore have always to watch ourtube. To know our tube, the resistanceof the same, and the proper techniqueis the whole secret of good results inradiology. The discovery of Roentgen,which makes possible and easy an abso-lutely correct diagnosis where previously uncertainty and error outweigheddefinite knowledge, through this resultsin experimentation and researches seemsto be still more important. THE AMERICAN X-RAY JOURNAL. 1057 LESSON V. Induction Coils. The induction coils used with x-rayapparatus are built on one and the sameprinciple. The most practical point sofar substantiated in the coil is that al-most instanteous skiagraphs can be ob-tained with not less than a 12-inch spark-gap. Larger coils than this are not re-quired for general use. The commonly. known Ruhmkorff Coil is used mostly,being named after Ruhmkorff, of Paris,who, although not the inventor of same,made many instruments of the kind, andcontrived various improvements. Thereis no question about it that one of themost important factors in the produc-tion of the x-ray is a perfect working-induction coil, as upon its action dependsthe satisfactory fluorescence of thevacuum tube. In the laboratory of anexpert the coils are used, being verymuch more powerful, and as it is claimedgiving effects which cannot be producedwith a static machine. The coils are notaffected by atmospheric changes and arein some instances portable. In my ex-perience the coils gave us good resultsin skiagraphy, especially when the induc-ing currents were short, sharp, snappyand vigorous in connection with a goodinterrupter, but we like the work of astatic machine just as well. In regardto the portability the coil certainly playsthe main part and then is by far the mostsatisfa
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