bids are invited for ph 1092 c light and optics class demo kit , ph 1014 s working of switch , ph 1036 c conductor and insulator , ph 1013 s magnetic spring repulsion of magnets , ph 1003 s levitation of pencil , ph 1034 t make your own sundial , ph 1042 c yarn spindle. , ph 1043 s fibre to fabric. , ph 1019 s uses of pulley in our life , ph 1007 s day and night diy kit earti is titilled vertically 23 degree , ph 1025 s infinite images when two mirrors are parallel. , ph 1044 s make your own compass , ph 1045 c multi circuit panel board , ph 1046 c make your own bridge , ph 1086 s elastic powered boat , ph 1047 c electricity and magnetism kit , ph 1048 s electromagnet making kit , ph 1049 s electromagnetic repulsion , ph 1016 c mixing of colors and white light formation , ph 1018 c ray box lenses kit , ph 1050 c anemometer , ph 1015 s reflection of light kit , ph 1051 t magnetic levitation and maglev train , ph 1052 t working model of tornedo , ph 1053 s kaleidoscope making kit , ph 1037 t heating effect from electricity , ph 1005 s frictionless propeller kit , ph 1054 s wind powered crane , ph 1010 s airfoil designs and shapes , ph 1024 s calculate no. reflection with two mirror , ph 1017 s centrifugal force in the earth kit , ph 1029 s air pressure and atomic pressure , ph 1033 t static electricity kit , ph 1055 c hydraulic arm , ph 1039 t rgb diy kit , ph 1056 s air powered car , ph 1030 s wind mill kit effect air pressure on our life , ph 1012 s sprinkle how air pressure help in drinking water with straw pipe , ph 1057 t lever and fulcrum function kit , ph 1022 s properties of air kit , ph 1020 s working of rope way , ph 1058 s electric propeller boat , ph 1006 s working model of gyroscope , ph 1031 s balloon car , ph 1059 t twin pendulum , ph 1060 t up hill cone small , ph 1061 c motion car , ph 1062 t working model of trebuchet , ph 1063 c sound and vibration kit , ph 1027 s concept of buoyancy and archmides principal , ph 1004 t maxwell wheel , ph 1064 c seri