A SURVEY programme to take H α photographs of galactic emission nebulae has been in progress since October 1966 at the Tokyo Astronomical Observatory using the 50 cm Schmidt telescope at the Dodaira Station1. A combination of Eastman Kodak 103a-E plate and Hoya colour glass R64 5 mm thick are being used. The combination gives a passband about 300 A wide centred at λ6563 A, and provides H α pictures of emission nebulae after subtraction of other nebular radiations contained within the passband. Each plate is carefully calibrated by means of a tube sensitometer; the absolute brightness scale is obtained by measuring the brightness of selected star images.