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The Trinity Bridge
A Mirror Image (in a plane mirror) is a reflected duplication of an object that appears almost identical, but is reversed in the direction perpendicular to the mirror surface. As an optical effect it results from reflection off from substances such as a mirror or water. It is also a concept in geometry and can be used as a conceptualization process for 3-D structures. Two-dimensional mirror images can be seen in the reflections of mirrors or other reflecting surfaces, or on a printed surface seen inside-out.
If we first look at an object that is effectively two-dimensional (such as the writing on a card) and then turn the card to face a mirror, the object turns through an angle of 180° and we see a left-right reversal in the mirror. In this example, it is the change in orientation rather than the mirror itself that causes the observed reversal. Another example is when we stand with our backs to the mirror and face an object that's in front of the mirror. Then we compare the object with its reflection by turning ourselves 180°, towards the mirror. Again we perceive a left-right reversal due to a change in our orientation. So, in these examples the mirror does not actually cause the observed reversals.
Trinity Bridge (Troitskiy Most) is a bascule bridge across the Neva in Saint Petersburg. It connects Kamennoostrovsky Prospect with Suvorov Square. It was the third permanent bridge across the Neva, built between 1897 and 1903 by the French firm Société de Construction des Batignolles. It is 582 meters (1,909 ft) long and 23.6 meters (77 ft) wide. The bridge takes its name from the Old Trinity Cathedral which used to stand at its northern end. In the 20th century, it was known as Equality Bridge (1918–1934) and Kirovsky Bridge (1934–1999).
In 1803, the Voskresensky ponton bridge, which was built in 1786 near Voskresensky Prospect (now Chernyshevsky Prospect), was moved to the Summer Garden. In 1825, the pontoon Suvorovsky Bridge was built to link Suvorov Square with Troitskaya (Trinity) Square. In 1892, a contest for constructing a permanent Troitsky Bridge was announced. There were 16 entrants from local and European engineers, including one from the French engineer Gustave Eiffel, the creator of the famous Eiffel Tower in Paris. The winner was the out-of-competition conception by Paul-Joseph Bodin aided by Arthur Flachet, Vincent Chabrol, and Claude Patouillard from the French Société de Construction des Batignolles. Some contributions to their proposal were provided by a team of local engineers. A special commission from the Imperial Academy of Arts, including Leon Benois also participated in the project. Construction began on 12 August 1897. Félix Faure, the president of France was present at the ceremony. In the same political spirit, Nicholas II laid the foundation stone for the Pont Alexandre III in Paris, another memorial to the Franco-Russian Alliance. The bridge was completed in 1903, in time for the 200-year anniversary of Saint Petersburg.
The Trinity Bridge
A Mirror Image (in a plane mirror) is a reflected duplication of an object that appears almost identical, but is reversed in the direction perpendicular to the mirror surface. As an optical effect it results from reflection off from substances such as a mirror or water. It is also a concept in geometry and can be used as a conceptualization process for 3-D structures. Two-dimensional mirror images can be seen in the reflections of mirrors or other reflecting surfaces, or on a printed surface seen inside-out.
If we first look at an object that is effectively two-dimensional (such as the writing on a card) and then turn the card to face a mirror, the object turns through an angle of 180° and we see a left-right reversal in the mirror. In this example, it is the change in orientation rather than the mirror itself that causes the observed reversal. Another example is when we stand with our backs to the mirror and face an object that's in front of the mirror. Then we compare the object with its reflection by turning ourselves 180°, towards the mirror. Again we perceive a left-right reversal due to a change in our orientation. So, in these examples the mirror does not actually cause the observed reversals.
Trinity Bridge (Troitskiy Most) is a bascule bridge across the Neva in Saint Petersburg. It connects Kamennoostrovsky Prospect with Suvorov Square. It was the third permanent bridge across the Neva, built between 1897 and 1903 by the French firm Société de Construction des Batignolles. It is 582 meters (1,909 ft) long and 23.6 meters (77 ft) wide. The bridge takes its name from the Old Trinity Cathedral which used to stand at its northern end. In the 20th century, it was known as Equality Bridge (1918–1934) and Kirovsky Bridge (1934–1999).
In 1803, the Voskresensky ponton bridge, which was built in 1786 near Voskresensky Prospect (now Chernyshevsky Prospect), was moved to the Summer Garden. In 1825, the pontoon Suvorovsky Bridge was built to link Suvorov Square with Troitskaya (Trinity) Square. In 1892, a contest for constructing a permanent Troitsky Bridge was announced. There were 16 entrants from local and European engineers, including one from the French engineer Gustave Eiffel, the creator of the famous Eiffel Tower in Paris. The winner was the out-of-competition conception by Paul-Joseph Bodin aided by Arthur Flachet, Vincent Chabrol, and Claude Patouillard from the French Société de Construction des Batignolles. Some contributions to their proposal were provided by a team of local engineers. A special commission from the Imperial Academy of Arts, including Leon Benois also participated in the project. Construction began on 12 August 1897. Félix Faure, the president of France was present at the ceremony. In the same political spirit, Nicholas II laid the foundation stone for the Pont Alexandre III in Paris, another memorial to the Franco-Russian Alliance. The bridge was completed in 1903, in time for the 200-year anniversary of Saint Petersburg.