bids are invited for interactive flat panel and computer desktop system, 1 battery eliminators ( superior quality ) dc, 2- 12v dc, 2amp 2 ammeter ( edm-80 ) square dial, moving coil, dc with desk stand range 0-1amp. 3 bar magnet, 50x10x5mm ( 2 ) 4 compass magnetic dia 18mm, both side glass ( b.s.g ) . 5 constantan wire / resistance wire ( 100gm ) . lens ( exact focal length ) dia 2 6 fl 25cm, concave lens ( exact ) lens ( exact focal length ) dia 2 7 fl 25cm, convex lens ( exact ) convex mirror, f.l.25cm, dia 50mm 8 00 concave mirror, f.l.25cm, dia 50mm 9 copper wire ( dcc wire ) double cotton covered 10 for connections, 500gm. 11 drawing board, 12x18 12 12 glass prism; equilateral 60x60x60º 50mm 13 glass slab ( english glass ) , 75x50x12 mm, , 4 horse shoe magnet / u magnet, 75mm. 15 lens holder, wooden v shaped magnifier plastic frame ( sup. ) , black colour, 3. 16 metal block rectangular, 4x3x2cm ( aluminium ) . 17 meter scale, one meter ( mdf ) 18 19 meter scale, half meter ( mdf ) 20 mirror strip mounted on wooden base, 4x2. 21 optical bench ( all wooden ) . 22 over flow vessel, plastic 23 plug key, one way with brass block. resistance box, ( brass ) plug type; constantan coil, 9mm thick brass block, 1 to 1000 ohm. 24 24 25 resistance coil, round bakelite case. ( 1 ohm ) 26 resistance coil, round bakelite case. ( 10 ohm ) 27 27 resistance coil, round bakelite case. ( 20 ohm ) rheostat ( brass rod ) , 4.3cm dia tube, length 15cms, 50 ohms, 1.6 amps 28 28 29 rubber pad. 30 slinky spring, 75x50mm.