Siddh Gopal Yantra on Bhoj Patra. This Yantra is used for money, all kind of prosperity, and to get baby boy. A Shaligram or Laddoo Gopal (child form of lord Krishna) is to be placed. Puja is to be done with Tulsi leaves, butter with Mishri (sugar candy). For Eleven full moon (Purnima) recitation of Gopal Sahastra Naam is very effective in obtaining best results.