I'm interested in collecting 'rules of thumb'. That is, the conversion factors that rely on expert knowledge (or mindless repetition), rather than universally accepted values. How many litres/gallons of paint to paint 100 full depth supers? How many board feet/metres of timber to create 100 boxes? How many lb/kg wax from extracting 1 ton/tonne of honey? How many pounds/kilos of nails for 100 supers? Be sure to include all your assumptions: full depth/half depth boxes? How many nails in each corner? etc. ------------------------------------- Nick Wallingford Bay of Plenty Polytechnic (East coast, N Island, New Zealand) Internet [log in to unmask] -------------------------------------