I want to know the answer to the following question:
What gun did the Royal Navy start using?
All the background I'm provided with is that "However, the performance of both 3.7 and 4.5-in guns was limited by their standard fuse No 199, with a 30-second running time, although a new mechanical time fuse giving 43 seconds was nearing readiness.". Is that enough to answer the question?
Answer: no