may find particular application for rmn magnetometer probes application_number US 65582891 A description fig3 a 3c show three elements making it possible to embody a capacitor according to a first embodiment these elements are constituted by a first nonconducting tube 50 externally coated with a first conductive film formed of strips 52 electrically separated from one another by intervals 54 a second nonconducting tube 56 coated with a second conductive film 58 cut by an interval 60 a central core 62 coated with a third conductive film formed of strips 64 separated by intervals 66 the core 62 is nested in the tube 56 which is nested in the tube 50 thus a double capacitor is obtained with three armatures the central armature being constituted by the conductor 58 on the tube 56 in this embodiment the nonconducting tubes may be made of quartz pyrex macor registered trademarks etc these tubes are machined to one hundredth of a millimeter they may also be embodied in porcelain by moulding the conductive films may be obtained by depositing silver paint directly spread onto the outer surface of the tubes and onto the central core and by annealing at 550 u00b0 c the thickness of the conductive film is about 2 100 mm it is also possible to obtain such tubes by depositing a conductive material on a flat insulant made of mica for example by engraving this conductor so as to obtain strips and then by winding the unit so as to obtain a tube with the desired diameter it is also possible to glue.