Captured with a full-frame mirrorless camera and 21mm lens.
This is mostly a study of lines, particularly the handrail (which provides an anchor for the eye to follow), but also the curved railing at the bottom of the stairs at left. I was attracted to the austere, utilitarian design, yet the curved pipe railing has an almost almost elegant, art deco look to it.
This was a difficult perspective to work from. A tripod was essential for framing, but it was crowded behind me. Had to be quick.
NYC's IRT subway, opened in 1904, is powered by a 600 volt DC third rail running alongside the tracks. Power is fed to the system via a number of substations throughout the city, where high voltage AC is converted to the lower voltage DC used by trains. Until recently, this was done with electromechanical rotary converters (essentially a combination AC motor and DC generator). They have been supplanted by solid state rectifiers, but a few of the original rotary converters remain operational.
It's worth noting that at the time the IRT opened and all this was built, commercial electrical power had only been available in NYC for about 20 years, and still wasn't available everywhere in the city. Much of the subway's infrastructure had to be invented, engineered, or perfected as it was being built.
Les clés de la porte à triple serrure qui protégeait la salle des #archives à l'hôtel de ville de #Lyon entre 1646 et les années 1860. En guise de porte-clefs, une chaîne avec un #blason où il est écrit : "UNE DES CLEFZ DE LA CHAMBRE A VOULT OU SO[n]T LES PAPIERS ET TILTRES DE LA VILLE".
La porte a suivi les déménagements successifs des #ArchivesDeLyon jusqu'au bâtiment actuel, où elle trône dans le hall.