29000 kilometers to repair 1500 lighthouses, planes cannot be seen clearly at night, and American style infrastructure is done as soon as it is said

Tech 2023-07-24 22:52:04 Source: Network

Today, it is difficult for us to imagine what efforts humans have made in history to sail far.In the early 1920s, the State Post Bureau of the United States faced a very difficult problem

Today, it is difficult for us to imagine what efforts humans have made in history to sail far.

In the early 1920s, the State Post Bureau of the United States faced a very difficult problem. That is the postal route spanning the east and west coasts of the United States, which has very poor direct flight safety and frequent flight accidents. The main cause of flight accidents is,Lost in the Air.

(1924, American Airmail route)

Although a compass can be installed on an aircraft, it is still in progressAerial survey navigation...

To solve such a problem, the pilot adopted a more primitive approach...

(Ford 5-AT stops on the airport runway and opens the cargo door)

....

(Loading and unloading parcels)

...

(Lighthouses were once an indispensable practical part of the global maritime navigation system and an important witness to human marine civilization)

.16606101.

60...

1923.1019331500.18000.

10..

.20..

...

20..1933.

30.1973.

301500.

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