Page:The slide rule; a practical manual by Pickworth, Charles N.djvu/123

Rh AUVKKTISKMENTiS FOUNDED 1770 SLIDE RULE MANUFACTORY ESTABLISHED 1820 T 3 AYERNIER=GRAYET (PAUL MICHON, Successor) 19 RUE MAYET, PARIS YI. Awarded Gold Medals— Paris, 1878, 1889, 1900 ; Moscow. 1891 : Brussels, 1897 ; Liege, 1905 ; Milan, 1900. Slide Rules in 40 different forms THE BEGHIN SLIDE RULE (Awarded a (Jold Medal at the Tourcoing Exhibition, 1906) Thin instrument enables many calculations to be made with one setting ; traversing the slide to change indices is avoided, and more accurate results are therefore obtained. PRICES AND PARTICULARS ON APPLICATION TAVERNIER-GRAVET SLIDE RULES are obtainable through the leading English Instrument Dealers The PHOSPHOR BRONZE CO., Ltd. 87 SUMMER ST., SOUTHWARK, LONDON, S.E. PHOSPHOR BRONZE (The original Cog Wheel and Vulcan Brands). Fot Slide Valves, Bearings, Bushes, Pinions, Worms and Worm Wheels, Motor Gear- ing, etc. BABBITT'S METAL (Vulcan Brand). NINE GRADES PLASTIC METAL (Vulcan Brand), for Lining 1 Ictrings, etc. ANTI-FRICTION METALS ("White Ant" Brand). Cheaper than Babbitt's. PHOSPHOR COPPER and PHOSPHOR TIN (Cog Wheel Brand). The finest quality made. Rolled and Drawn Phosphor and other Bronze Castings in Phosphor Bronze, Gun Metal and Aluminium, to patterns oi draw- ings J machined if required. Chill Bar and Tube Castings for turning into small Bearings and Bushes, Spindles and Small Pump Rods.