The chief difference lay in the mounting of these starkly beautiful weapons. They seemed to be fixed on a movable pivot set into the coal black rock itself. Like modern artillery, these curious pieces of ordnance bore a bronze shield to protect their crews, through which projected the long and very narrow barrels of the guns. Grouped like cannoneers about their piece stood various red-crested Atlantean artillerymen. At a glance Nelson recognized the difference in their equipment from that of the spearmen behind them. These former bore no shields, no swords or bombs, but wore that same kind of leather body-armor which graced the powerful limbs of Hero Giles. Their helmets, too, were different: only the dolphin crest with a tuft of red feathers spouting from it bore any resemblance to those of the infantry, and, moreover, the artillerymen's eyes were shielded by goggles with thick blue lenses. * * * * * As the Hero approached, officers among them saluted, then sank on one knee with head humbly bent. "Rather odd looking guns," commented Nelson. "I'm not much of an artilleryman, but I'm wondering how you take up the recoil?" The Atlantean's laugh, which always reminded his guest of the purr of a tiger, rang out. "Why, marry, good sir, there is no recoil! These guns do not use that powder which Sir Henry, founder of our line, did speak of. Thou wouldst see one fired?" His curiosity immeasurably piqued, Nelson nodded, whereupon the Atlantean wheeled about and barked a brief command. With truly Prussian precision, the artillerymen sprang to their posts, some to a series of levers which sprouted from the rock platform without any apparent connection, and some to wheels and gauges of varying size that clustered in bewildering intricacy about the breech of the great brass gun. "Markest thou that tree yonder, on the ledge of the valley?" The Atlantean's blunt outstretched finger indicated a towering pine sprouting from among a mass of reddish volcanic rock at the rim of that new world. "Yes, I see it, but--" Nelson was astounded. A pine tree in the upper Arctic! That alone was sufficient cause for amazement. From a stiff red-plumed gun captain issued a brief series of commands which set the wonderfully drilled crew to silently adjusting their training and elevating mechanism. Click! Clack! Sis-s-s-s! * * * * * All up and down the vast staircase other gun crews stood watching. Nelson saw their weird, bluish goggles raised to that platform where, for all the world like a coast defense howitzer, the great cannon swung majestically about on the ponderous, brazen column which seemed to support it. Gradually the muzzle was elevated, then traversed a few feet, to finally come to a halt. "Jakul, a Hero!" shouted the gun captain, his hand raised to Hero Giles. "Thou art ready, Friend Nelson?" he inquired in tolerant amusement. "Mark well yon pine tree! "Storr!"