My interest may be understood when I explain that I have, as an instructor for Ordnance, schooled hundreds of men in the theoretical and practical phases of carburetion. With all respect to “Shop Foreman” I must support Lt. McDowell in his contention that the ratio is based on weight. Furthermore, in the interests of your readers among the military technicians and your technically minded civilian readers, I think that this subject, that is in so frequent controvery, should be cleared up. To do this must necessarily involve some rather dry technical computation. If you will bear with me I will get under way.