Discussion on "The machining of non-metallic materials" at the London Section of the Institution

MR. MCGUIBE: I think we must congratulate our lecturer on the remarkable way in which he has delivered his paper. It is quite evident that he is most practical with every subject he has brought forward. Although he has not touched a wide range of non-metallic substances he has touched sufficient to create considerable interest this evening. I should like to ask him why it :´s necessary to grind some of the mouldings he has mentioned this evening when, so we are told, we can get mouldings from the mould within limits of plus and minus 2.