The next ten years of destroyer construction were all under the Washington Treaty which gave a size of 1500 tons for destroyers. Like all of the Treaty limits, it was found that there was a large difference between what you wanted to build and what you were allowed to build. Most Navies ended up with very similar solutions to the 1500 ton problem. Four main guns, two sets of torpedoes and speed of 34-36 knots. That was a basic ship. Some navies had more guns and less torpedoes, slower speeds. Whatever made their slide rules add up to the '1500' tons.
The Albacore type was well liked. It was not till 1930 that the ships looked like the above drawing. Things like the quad 2 pounder took awhile before they came down to destroyers, the cruisers and capital ships had first dibs on production. The first eight ships were completed with triple mountings of torpedoes, then the rest of the class had quadruple sets. The mid 1930's also saw the fitting of sophisticated gun directors. Asdic and better quality depth charges were fitted in the late 1930's along with the 20mm Hispano-Suiza cannons. WW2 starts and the main upgrades are to the ships electronics. It is not until 1942 tat a major change will be made to the armament when the twin Bofors 40mm start coming into service. With 29 ships to service its takes a while before they are all refitted. Three had been lost before the final refits took place.
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The major change was the removal of one bank of torpedoes to open up space for more AA guns, depth charges and throwers. Hedgehog mortars would be placed beside the bridge.
