1. what is this tube-shaped thing?
2. Is this a crows nest, is the mast going through it or behind it?
3. What is this?
4. Is this some sort of early radar antenna?
5. Is this pole right behind the tip of main mast?
Your help on this matter will be much appreciated[/quote]
Hello,
1. was a tube to help pass the flags when hoisted or lowered
2. it was a crows nest
3. sort of hinge/attachment (?) to secure the yardarm stays (dont know the english term) - to keep them level
4. i dont know
5. behind
There are a couple of good quality pictures of the late war DD-939 ex Z-39 on the navy history site, maybe they help:
https://www.history.navy.mil/content/hi ... l?q=DD-939Additionally you might want to get the Whitley Book on Destroyers, there are many things covered
ISBN 1557503028
Best regards