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In 1925 the British adopted a new instrument developed by Vickers. It was a mechanical analogue computer Predictor AA No 1. Given the target height its operators tracked the target and the predictor produced bearing, quadrant elevation and fuse setting. These were passed electrically to the guns where they were displayed on repeater dials to the layers who 'matched pointers' (target data and the gun's actual data) to lay the guns. This system of repeater electrical dials built on the arrangements introduced by British coast artillery in the 1880s, and coast artillery was the background of many AA officers. Similar systems were adopted in other countries and for example the later Sperry device, designated M3A3 in the US was also used by Britain as the Predictor AA No 2. Height finders were also increasing in size, in Britain, the World War I Barr & Stroud UB 2 (7 feet optical base) was replaced by the UB 7 (9 feet optical base) and the UB 10 (18 feet optical base, only used on static AA sites). Goertz in Germany and Levallois in France produced 5 metre instruments. However, in most countries the main effort in HAA guns until the mid-1930s was improving existing ones, although various new designs were on drawing boards.

What was the designation name of the Sperry device in the US?
Answer: M3A3
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Kerry received his second Purple Heart for a wound received in action on the Bồ Đề River on February 20, 1969. The plan had been for the Swift boats to be accompanied by support helicopters. On the way up the Bo De, however, the helicopters were attacked. As the Swift boats reached the Cửa Lớn River, Kerry's boat was hit by a B-40 rocket (rocket propelled grenade round), and a piece of shrapnel hit Kerry's left leg, wounding him. Thereafter, enemy fire ceased and his boat reached the Gulf of Thailand safely. Kerry continues to have shrapnel embedded in his left thigh because the doctors that first treated him decided to remove the damaged tissue and close the wound with sutures rather than make a wide opening to remove the shrapnel. Though wounded like several others earlier that day, Kerry did not lose any time off from duty.

When did Kerry earn his 2nd Purple Heart?
Answer: February 20, 1969
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In their attempt to ensure white supremacy decades after emancipation, in the early 20th century, most southern states created laws based on the one-drop rule, defining as black, persons with any known African ancestry. This was a stricter interpretation than what had prevailed in the 19th century; it ignored the many mixed families in the state and went against commonly accepted social rules of judging a person by appearance and association. Some courts called it "the traceable amount rule." Anthropologists called it an example of a hypodescent rule, meaning that racially mixed persons were assigned the status of the socially subordinate group.

What made the one drop rule stricter than rules in the 19th century?
Answer:
it ignored the many mixed families in the state and went against commonly accepted social rules of judging a person by appearance and association.