Produced by Juliet Sutherland and the Online Distributed Proofreading Team at www.pgdp.net [Illustration] SCIENTIFIC AMERICAN SUPPLEMENT NO. 315 NEW YORK, JANUARY 14, 1882. Scientific American Supplement. Vol. XIII., No. 315. Scientific American established 1845 Scientific American Supplement, $5 a year. Scientific American and Supplement, $7 a year. * * * * * TABLE OF CONTENTS. PAGE I. ENGINEERING AND MECHANICS.--Watchman's Detecter. 5023 Integrating Apparatus. 5023 A Canal Boat Propelled by Air. 5023 Head Linings of Passenger Cars. 5023 Improved Mortar Mixer. 2 figures. 5023 Practical Notes on Plumbing. By J.P. DAVIES. Figs. 37 to 53. Tinning iron pipes, copper or brass work, bits, etc.--Spirit brush.--Soldering iron to lead.--Dummies for pipe bending.--Bends and set-offs.--Bending with water. --Sand bending.--Bending with balls or bobbins.--Three-ball or lead driving ball and double ball bending.--Bending with windlass and brass ball.--Hydraulic or cup leather and ball bending.--Bending by splitting, or split made bends. --Pulling up bends.--Set-offs.--Bad bends.--Bad falls in bends.--Bends made into traps or retarders.--Bends made with the "snarling dummy." 5024 The Grossenhain Shuttle Driver. 1 figure. 5025 II. ELECTRICITY, MAGNETISM, ETC.--The Electro-Magnetic Apparatus of Dr. Pacinotti. 8 figures. The Pacinotti electro-magnetic machine of 1860.--The Elias electro-motor of 1842. 5015 The Elias Electro-Motor. 5016 Bjerknes's Experiments. 7 figures. 5016 The Arc Electric Light. By LEO DAFT. 5018 Hedges' Electric Lamps. 4 figures. 5019 Electric Railway Apparatus at the Paris Electrical Exhibition. 17 figures. Lartigue's switch controller, elevation and sections.--Position of commutators during the maneuver.--Pedal for sending warning to railway crossing, with elevation and end and plan views.--Electric Alarm.--Lartigue's bellows pedal, with plan and sections.--Brunot's Controller.--Guggemos' correspondence apparatus.--Annunciator apparatus.--Lartigue's controller for water tanks.--Verite controller for water tanks. 5019 The Telephonic Halls of the Electrical Exhibition. 1 figure. 5022 The Action of Cold on the Voltaic Arc. 5022 III. TECHNOLOGY AND CHEMISTRY.--Industrial Art for Women. 5026