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insurance of lives, with tables and calculations VI. MATHEMATICS.--The Trisection of Any Angle.--By FREDERIC R. HONEY, Ph.B.--A very ingenious demonstration of this problem, based on the properties of conjugate hyperbolas VII. METEOROLOGY.--Note on the Mt. Blanc Meteorological Station The Flood at Karlsbad.--Account of the recent flood and of its destructive effects.--1 illustration VIII. MECHANICAL ENGINEERING.--Station for Testing Agricultural Machines.--A proposed establishment for applying dynamometer tests to agricultural machines.--1 illustration Steam Engine Valves.--By THOMAS HAWLEY.--A review of modern slide valve practice, the lap, cut-off, and other points.--6 illustrations IX. MISCELLANEOUS.--Science in the Theater.--Curious examples of stage effect in fictitious mesmerizing and hypnotizing.--4 illustrations Theatrical Water Plays.--Recent episodes in real water plays at Hengler's Circus, London.--2 illustrations X. NAVAL ENGINEERING.--The French Ironclad War Ship Colbert.--An armored wood and iron ship, with central battery.--1 illustration XI. PHYSIOLOGY AND HYGIENE.--Newer Physiology and Pathology.--By Prof. SAMUEL BELL. M.D.--An excellent presentation of modern practice in the light of bacteriology Test Card Hints.--How to test the eyes for selecting eyeglasses and spectacles The Composition of Koch's Lymph.--What Prof. Koch says it is and what it can do.--The cabled account of the disclosure so long waited for XII. TECHNOLOGY.--Firing Points of Various Explosives.--The leading explosives, with the temperature of their exploding points tabulated The Recovery of Gold and Silver from Plating and Gilding Solutions--A paper of interest to silver and gold platers, as well as photographers Water Softening and Purifying Apparatus.--An apparatus for treatment of sewage, etc., chemically and by deposition.--1 illustration * * * * * THE FRENCH IRONCLAD WAR SHIP COLBERT. The central battery ironclad Colbert is one of the ten ships of the French navy that constitute the group ranking next in importance to the squadron of great turret ships, of which the Formidable is the largest. The group consists of six types, as follows: 1. The Ocean t
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