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This image depicts a classroom or lecture hall environment in Targovishte, Bulgaria, focusing on a dark gray blackboard covered in white chalk markings. The top portion of the frame shows a light brown wooden frame above the blackboard, with partially visible schematic diagrams on lighter panels above it.

The blackboard features various writings and diagrams. On the left side, Bulgarian Cyrillic words are written vertically: "ИНДУКТИВНИ" (Inductive), "ИНДУКЦИОННИ" (Induction), and "КАПАЧИТИВНИ" (Capacitive). Below these, a vertical line separates a list of other Bulgarian terms: "Засичам" (I detect), "Метал" (Metal), "Течности" (Liquids), "Прах, Гласка" (Dust, Gloss), "H Вода" (H Water), and "Температура" (Temperature).

In the center-right section, "IEEE 1394" and "Fire Wire" are written in English. To the right of these texts, two diagrams are drawn. The upper diagram illustrates a U-shaped magnetic core with a coil wound around one leg, featuring a double-headed arrow within the core indicating flux or movement. Wires extend from the coil. The lower diagram is a triangular graph with axes labeled "U" and "t°", containing a curved line marked "e1" and "e2". The Bulgarian word "горе" (up/above) is written near the "t°" axis.

Below the blackboard, a horizontal ledge, functioning as a chalk tray, is visible. It contains traces of white chalk dust and a small, intact piece of white chalk positioned on its right side. The wall beneath the ledge is paneled with vertical strips of reddish-brown wood.

A person's right shoulder and upper arm, dressed in a dark gray jacket or coat, are partially visible in the bottom right corner of the frame, indicating an individual's presence in the immediate foreground, likely facing the blackboard.
Filse

Mar 23, 2026

Targovishte, Bulgaria

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This image depicts a classroom or lecture hall environment in Targovishte, Bulgaria, focusing on a dark gray blackboard covered in white chalk markings. The top portion of the frame shows a light brown wooden frame above the blackboard, with partially visible schematic diagrams on lighter panels above it. The blackboard features various writings and diagrams. On the left side, Bulgarian Cyrillic words are written vertically: "ИНДУКТИВНИ" (Inductive), "ИНДУКЦИОННИ" (Induction), and "КАПАЧИТИВНИ" (Capacitive). Below these, a vertical line separates a list of other Bulgarian terms: "Засичам" (I detect), "Метал" (Metal), "Течности" (Liquids), "Прах, Гласка" (Dust, Gloss), "H Вода" (H Water), and "Температура" (Temperature). In the center-right section, "IEEE 1394" and "Fire Wire" are written in English. To the right of these texts, two diagrams are drawn. The upper diagram illustrates a U-shaped magnetic core with a coil wound around one leg, featuring a double-headed arrow within the core indicating flux or movement. Wires extend from the coil. The lower diagram is a triangular graph with axes labeled "U" and "t°", containing a curved line marked "e1" and "e2". The Bulgarian word "горе" (up/above) is written near the "t°" axis. Below the blackboard, a horizontal ledge, functioning as a chalk tray, is visible. It contains traces of white chalk dust and a small, intact piece of white chalk positioned on its right side. The wall beneath the ledge is paneled with vertical strips of reddish-brown wood. A person's right shoulder and upper arm, dressed in a dark gray jacket or coat, are partially visible in the bottom right corner of the frame, indicating an individual's presence in the immediate foreground, likely facing the blackboard.

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Mar 23, 2026

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