Measurement and calculation of the ventilation through a vertical sash-window without wind. Messungen und Berechnungen uber Stossluftung durch vertikal Schiebefenster bei Windstille.

Reports measurements of the natural ventilation through a vertical sash-window in calm weather. Describes test window and room. Gives theoretical expression for the ventilation depending on the amount the window is open, inside to outside temperature difference and the difference in height of the openings. Reports two tests of ventilation rate made using smoke. Concludes that a vertical sash window gives very good ventilation even without wind. Finds that tests corraborated the formula which would also apply to a deeper room.