Radio-active Screens (Willemite), 6d. per sq. inch. Plat. Bar. Cyan Screen., 9d. sq. inch
Radio-active Screens (Zinc Sulph.), 10 × 10 cm. 7/6.
Professional Men, Universities, Schools, &c., allowed special terms.
Our newly invented Thorium Inhalers may be had on hire.
ARMBRECHT, NELSON & CO.,
71 & 73, Duke Street, Grosvenor Square, London, W.
Telephone: Gerrard 4942.