. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . Fig. 9. Medium-sized static machine, with four revolving plates one metre in diameter. (Rollins.) X-RAY EQUIPMENT 19 which terminal of a static machine will be positive before the machineis started, this is a convenient arrangement. Thomsons (Elihu) Dynamo Static Machine. — This machine is notso much influenced by moisture as the Holtz machine, and it occupiesa smaller space. Induction Coils • The usual form of induction coil consists of a primary
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . Fig. 9. Medium-sized static machine, with four revolving plates one metre in diameter. (Rollins.) X-RAY EQUIPMENT 19 which terminal of a static machine will be positive before the machineis started, this is a convenient arrangement. Thomsons (Elihu) Dynamo Static Machine. — This machine is notso much influenced by moisture as the Holtz machine, and it occupiesa smaller space. Induction Coils • The usual form of induction coil consists of a primary coil, throughwhich the exciting current of electricity is passed, and a secondary coil,— these two coils being separated by an insulating tube of hard rubber;. Fig. 10. Diagram showing the construction of an induction coil. (Rollins.) the primary coil is made up of a comparatively few turns of coarse wirethat is usually wound around a soft iron core ; the secondary of manyturns of fine wire that is generally wound over the tube covering theprimary coil, but is sometimes so arranged as to be near it, not overit. Ritchie invented the now generally adopted method of winding thesecondary in sections. In the circuit of the primary is a break whichinterrupts the current; every time the current is made or broken in theprimary, a current of higher voltage is induced in the secondary. It isthis latter current which is sent through the vacuum tube. Condenser. — A condenser, that is made up of many sheets of tinfoil insulated from each other by paper coated with shellac, is placed inthe primary circuit to make the interruptions of the current more 20 THE ROENTGEN RAYS IN MEDICINE AND SURGERY sudden, and thereby the spark-length of the coil is increas
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