shall be settled on the principle of cross liabilities as if the owners of each vessel had been compelled to pay to the owners of the other of such vessels such one-half or other proportion of the latter's damages as may have been properly allowed in ascertaining the balance or sum payable by or to the assured in consequence of such collision; and it is further agreed that the principles involved in this clause shall apply to the case where both vessels are the property, in part or in whole, of the same owners, all questions of responsibility and amount of liability as between the two ships, being left to the decision of a single arbitrator, if the parties can agree upon a single arbitrator, or failing such agreement, to the decision of arbitrators, one to be appointed by the managing owners of both vessels, and one to be appointed by the majority in amount of underwriters interested in each vessel; the two arbitrators chosen to choose a third arbitrator before entering upon the reference, and the decision of such single, or of any two of such three arbitrators, appointed as above, to be final and binding.
"This insurance also specially to cover loss of and/or damage to hull or machinery through the negligence of master, mariners, engineers, or pilots, or through explosions, bursting of boilers, breakage of shafts, or through any latent defect in the machinery or hull, provided such loss or damage has not
