The western quarter of the Jaipur ObservatoryiJantar Mantar)
At the left end is the mortar-shaped Jai Prakâsh Yantra,
at the center is Nari Valâya Uttar Gôla Yantra, and on the right is Lâghu
Samrât Yantra that was built by a descendant of Jai Singh in the 19th century.
On the right end is Unnatansha Yantra (Altitude Instrument), made of metal. In the far
background is a pair of circular Râm (or Râma) Yantras (Altitude/Azimuth Instruments).