26 pages + 4 pages of photograph illustrations, rare early tecnical report on cigarette filters, inc structure, chemical research, nicotine, Pyridine (it states ; it is almost certain that pyridine derivatives are highly responsable for morning cough which later lead to chronic bronchitis and cardiac failure), Ammonia, Tar, experimental reports, etc. & Summary.Binding codition Fair, Green paper cover have some minor dirt & corner tip folds , some ageing etc , but complete & not torn. contents are fair with no major faults, a few minor fox dots, handling , corner tip folds, hinges are rusty and should be relaced, centre pages loose /not damaged, no inscriptions. A rare tecnical cigarette smoking item with interesting photographs of 2 electronic smooking machines being used for thier research. .at time of putting on net could not find another copy for sale anywhere. 18.5 x 24.5cm. Approx