Page:The slide rule; a practical manual by Pickworth, Charles N.djvu/127

Rh ADVERTISEMENTS A. W. FABER 149 QUEEN VICTORIA STREET LONDON, E.G. - - Manufactories in Germany, France and United States. Houses in London, Paris, Berlin and Newark, U.S.A. Gold and First-class Prize Medals. GRAND PRIX (Highest Award) PARIS, 1900 GRAND PRIZE (Highest Award) St LOUIS, 1904. SUPERIOR LEAD AND COLOURED PENCILS DRAWING MATERIALS FOR ENGINEERS, ARCHITECTS AND SURVEYORS. A. W. FABER'S IMPROVED CALCULATING RULES. "The utmost accuracy, combined with the most perfect workmanship and finish." DESCRIPTIVE PAMPHLET ON APPLICATION. A. W. FABER'S productions may be obtained from all Dealers in Drawing Instruments or Stationers. PENCIL MANUFACTORY ESTABLISHED 1761