Happy Valentine’s Day!
In the historic centres of both Ahmedabad and Baroda (Vadodara), there are a few very tall, several storeys high (higher than the buildings next to them), metal poles sprouting from the pavement. They are all topped with metalwork objects as illustrated in my photograph published below.
Most people, whom I asked, had no idea what purpose these poles and their curious apparatus served. I posted pictures of these tall poles on Facebook, and then received a number of suggestions as to what they might be. Most people, seeing the arrows, suggested that they may have been old weather vanes for determining wind direction, but I felt that this was an unlikely for these poles that look as if they were put up by a municipal authority.
One person I asked in a street in Ahmedabad thought that the poles had something to do with drainage, maybe ventilation. I quite liked that speculative reply because the spheres surmounting all of the poles have two short pipes attached to them.
Recently whilst looking at the Internet I came across a picture (see https://www.arcgis.com/apps/MapJournal/index.html?appid=4c10a18d5cfa4da486df492765c2ad54) like mine. The picture was taken in Ahmedabad and is described as a sewage gas vent. This tallies with what I was told by one bystander.
A sewage gas vent that might have rotated to catch the prevaing breezes seems to be a plausible function for these poles BUT I cannot yet be sure if this is correct.
If anyone reading this can enlighten me more, please drop me a line or two in the comments section of this blog.