ASV: And over the head of the living creature there was the likeness of a firmament, like the terrible crystal to look upon, stretched forth over their heads above.

BBE: And over the heads of the living beings there was the form of an arch, looking like ice, stretched out over their heads on high.

DBY: And there was the likeness of an expanse over the heads of the living creature, as the look of the terrible crystal, stretched forth over their heads above.

KJV: And the likeness of the firmament upon the heads of the living creature was as the colour of the terrible crystal, stretched forth over their heads above.

JPS: And over the heads of the living creatures there was the likeness of a firmament, like the colour of the terrible ice, stretched forth over their heads above.

WBS: And the likeness of the firmament upon the heads of the living creature was as the color of the terrible crystal, stretched forth over their heads above.

WEB: Over the head of the living creature there was the likeness of an expanse, like the awesome crystal to look on, stretched forth over their heads above.

YLT: And a likeness 'is' over the heads of the living creatures of an expanse, as the colour of the fearful ice, stretched out over their heads from above.
