| TABLE OF CONTENTS. |
|---|
| I. | ELECTRICITY AND MAGNETISM.--Improved DynamoMachine. Eight figures. |
| An Improved Manganese Battery.--By GEO.LEUCHS. |
| The Cause of Evident Magnetism in Iron, Steel, andother Magnetic Metals.--By Prof. D. E. HUGHES.Neutrality.--Superposed Magnetism.--Elastic Nature of the EtherSurrounding the Magnetic Molecules. 3 figures. |
| II. | ENGINEERING.--The Westinghouse Brake. 2figures. |
| Hydraulic Elevators and Motors.--By B. F.JONES.--Bearing upon the Water Supply of Cities.--Cost of Waterused.--Objectionable effects on Water Works.--Best method ofarranging water supply.--Cause of Accidents.--Advantages of WaterMotors over Steam Engines.--Rates for Water Motors. |
| Water Supply of Small Towns.--Process of SofteningHard Water. Six figures. |
| Improved Water Meter. Several figures. |
| III. | TECHNOLOGY.--Washing Machine for Wool. 1figure. |
| Increasing the Illuminating Power of Gases,etc.--By V. POPP.-- 3 figures. |
| Preventing Iron from Rusting. |
| An Elastic Mass for Confectioners' Use. |
| Caoutchouc. |
| Photographic Action StudiedSpectroscopically. |
| Salt and Lime. |
| Renewing Paint without Burning. |
| A Green or Golden Color for all Kinds ofBrass.--By E. PULCHER. |
| Vinegar. |
| The Preservation of Meat by CarbonicAcid. |
| On the Adulteration of Soap.--By Dr. H.BRACKEBUSCH. |
| IV. | CHEMISTRY.--Testing Olive Oil.--By Dr. O.BACH. |
| On the Theory of the Formation of CompoundEthers. |
| The Alizarine Industry. |
| Reduction of Oxidized Iron by Carbonic ...
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