A rug would help, but it wouldn't stop the wind from climbing the insulationless walls or seeping through the gaps around the mopboards.
In the receiver there is a strong electromagnet, excited by a local current, which has in its circuit two annular air gaps, across which the magnetic field is practically uniform and constant.
Thus, in the case of one station and one moving railway carriage, there is a circuit consisting partly of the earth, partly of the ordinary telegraph wires at the side of the track, and partly of the circuits of the telephone receiver at one place and the secondary of the induction coil at the other, two air gaps existing in this circuit.
But there are gaps in Kant's system - a imperfect gap between sensation and the sense-forms of time and space; a gap between sense-forms and thought; a gap between the lower but practicable processes of the Understanding and the higher but unrealizable ideas of Reason.
Kant had fewer isolated points of departure than intuitionalists; yet gaps and isolation recurred in Kant, and helped to make him the father of modern agnosticism.