The Sphere Jun 5th 1915. Where a Zeppelin is Vulnerable. £11.50 Quantity: at £11.50 each Add To Basket 1 in stock. "Where a Zeppelin is Vulnerable : And where it is Protected." With Sketches showing why a Puncture on the Underside of a Zeppelin need not prove Fatal. Also some notes on the Zeppelin Incendiary Bomb.