Polemoscope

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A8 (Latvian) - Latvian main road is 76.10 km. It connects the capital of the country, Riga with the Latvian-Lithuanian border, where it goes to the Lithuanian main road A12 in the direction of Szawle. p> History

Hevelius built his instrument in 1637, and his description and technical drawings were published in the book "Selenographia sive lunae descriptio" (published in Gdansk in 1647).

In 1668, Jan III Sobieski, who was still a marshal, visited the astronomer's observatory and commissioned a set of observatory instruments, including a fieldwork, a blue and earth globe, a microscope and two telescopes. Hevelius, who practically applied his invention in the field of military technology, personally performed it for the future king of Poland.

In the 17th century, the fieldwork was used to observe battlefields from outside obstacles, which made it impossible to detect an observer or his wounded by missiles or shrapnel. The use of a pole-field during wartime, whose name translates as "far field", recalls Antoni Krasicki in his poem "War Reminders." Bibliography

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