The mirror was made of double glass: two thin mirrors with a space between.

That was why the secret of the double glass had proven so effective.

Her hands cradled the cup as she looked out through the double glass of the two wide windows.

The windows are of double armoured glass,' the director pointed out.

All the windows were of double glass.

The double glass cracked and crumpled and bent, but did not fly to bits.

He threw his brief case through the double glass of the raised window.

But Bosch knew the double glass made the vault room silent.

As she peered through the double glass her blood ran cold.

It was completely enclosed with double glass to cut down the thunder of her engines.