To estimate the molecular size & for surface tension investigations, using an oil film on water. Consists of 2 trays, 4 metal booms, 8 levelling wedges, 16 mounted wire loops, 8 graticules & special holders, olive oil, 8 beakers 10 ml, lycopodium powder, 2 dispensers, camphor & paraffin wax, vegetable black, one paint brush, one paint can and 2 sponges.