



Produced by Produced by Josephine Paolucci, Don Kretz, Juliet Sutherland,
Charles Franks and the DP Team





[Illustration]




Scientific American Supplement No. 415




NEW YORK, DECEMBER 15, 1883

Scientific American Supplement. Vol. XVI, No. 415.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.




TABLE OF CONTENTS.

I.    CHEMISTRY AND METALLURGY.--Carbon in Steel.

      Heat developed in Forging.

      Recent Studies on the Constitution of Alkaloids.--Extract from
      a lecture delivered before the Philadelphia College of Pharmacy.
      --By SAML.P. SADTLER.

II.   ENGINEERING AND MECHANICS.--Apparatus for Extracting
      Starch from Potatoes.--With engraving.

      A Simple Apparatus for describing Ellipses.--By Prof. E.J.
      HALLOCK. 1 figure.

      A Novel Propeller Engine.--With full description and numerous
      engravings.--By Prof. MACCORD.

      The New Russian Torpedo Boat, the Poti.--With engraving.

      A New Steamer Propelled by Hydraulic Reaction--Figures showing
      plan and side views of the steamer.

      A New Form of Flexible Band Dynamometer.--By Prof. W.C.
      UNWIN. 4 figures.

III.  TECHNOLOGY.--Enlarging on Argentic Paper and Opals.--By
      A. GOODALL.

      The Manufacture and Characteristics of Photographic Lenses.

      Improved Developers for Gelatine Plates.--By DR. EDER.

      The Preparation of Lard for Use in Pharmacy.--By Prof. REDWOOD.

      Anti-Corrosion Paint.

      Manufacture of Charcoal in Kilns.--Different kilns used.

IV.   ART, ARCHITECTURE, AND ARCHAEOLOGY