Thankfully, these quickly became a thing of the past and were replaced before the Second World War by lighter Crystallite balls made from the crushed shin bones of cows.

• 谢天谢地，这很快就成为了历史，在第二次世界大战之前，更为轻便的微晶球取而代之，它们由碾碎的母牛胫骨制成。