Perhaps I should have left the three arches together. “The symbol of a bridge with three arches is by no means rare” writes Day. Also: “Bro. Songhurst, in reply to my enquiry, considered that the Kirkwall illustration might perhaps refer to the degree of Red Cross of Babylon. I had suggested that the two figures on the centre arch were performing an act of reconciliation between the old covenant, represented by the Ten Commandments and the Brazen Serpent on the right, with the new covenant, represented by the Lamb and the Book of the Gospels on the left. Bro. Songhurst questioned my idea of “reconciliation,” and suggested that the figures might be lifting up their hands in hostility. I had based my reconciliation interpretation more on the fact that the figures appear to be kneeling.”
Jackson writes about the arches that they: “may allude to the 3 arched bridge in early K.T. ritual. Noah’s Ark, the Ten Commandments, serpent on a cross and figures in adulation can also be seen.”
Cooper sees in the three rainbows another battle between good and evil.
About the “Paschal Lamb” Jackson writes: “Curiously the Paschal Lamb in the bottom left has horns and instead of bearing the banner decorated with a St. George style cross which is more common, the design appears to be the Scottish cross of St Andrew.”
The lamb in still in use in Templar degrees and appears to refer to an officer.