The dark interior set off caution bells again.
His "Bells of Shandon" has always been greatly admired.
Never more than one pneumatophore is found in a cormus, and when present it is always situated at the highest point above the swimming bells, if these are present also.
An improvement was effected in this respect by the introduction of the " bridging " system, in which the bells possessing high inductance are placed in parallel between the two wires of the circuit.
Although the bells are constantly in circuit their high impedance prevents any appreciable interference with the telephonic currents.