a wellbore in the embodiment of fig2 a and 2b the coil spring and data wire 135 are disposed around an outer diameter of the mandrel 110 to minimize interference with the bore of the tool 100 in order to install the jar in a drill string each end of the jar includes an inductive coupling ensuring that a signal reaching the jar from above will be carried through the tool to the drill string and any component therebelow the induction couplings because of their design permit rotation during installation of the tool in another embodiment a series of coils at the end of one of the jar components communicates with a coil in another jar component as the two move axially in relation to each other fig3 a show a jar 100 with a housing 105 having a number of radial coils 150 disposed on an inside surface thereof each of the coils is powered with a conductor running to one end of the tool 100 where it is attached to drill string a single coil 155 is formed on an outer surface of a mandrel 110 and is wired to an opposing end of the tool the coils 150 155 are constructed and arranged to remain in close proximity to each other as the tool operates and as the mandrel moves axially in relation to the housing in fig3 a a single coil 150 is opposite mandrel coil 155 in fig3 b a view of the tool 100 after the mandrel has moved the coil 155 is partly adjacent two of the coils 150 but close enough.