a greyscale 45 degree perspective view line drawing of an ancient 1700 century astronomical pendulum oscillating clock (without a cabinet) used for gravimetrical observation. The pendulum is affixed to a wall. The room has a tile floor. The pendulum is slightly away from a wide open leaded diamond shaped window. The outside background is landscape and an ocean. The pendulum has a weight on a chain, a gear train, an escapement, and a weight on a rod. See more