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Volume 78, Issue 2019supp
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Features
History in Waste Paper
A Contract 2,215 Years Old
Telegraphing Pictures
New Casting Machine
For Making Perfect Pressure and Die Castings
Refractive Index of Radium Emanations
Lighthouses for Aerial Navigation
Their use in war and Commerce
An Aeroplane Bomb that Explodes only on Striking the Ground
Electric Mine Gas Detectors
Different Devices that Have Been Used or Suggested to Test for Gas with an Electric Lamp
The Melting and Solidifying Points of Lava
Navigation without Logarithms
Man's Chin
A Dynamical Basis for Physical and Psycho-Physiological Utilities
Applications of the Coolidge X-Ray Tube
Illustrating the Varied Subjects that are Within the Range of a Single, Simple Tube
Alcohol as a Motorcar Fuel
Heredity—I
New Theories and Facts Relating to the History of Organic Beings
Influence of Occluded Gases of the Selective Photoelectric Effect
Combined Effect of Electric and Magnetic Fields on Spectrum Lines
Artificial versus Natural Ice
Facts Showing that Wholesome Artificial Ice Can be Produced in Competition With the Natural Article
New Divisions of the Inch
Thread-Recording Micro-Barometer
Prof. William Bateson
President of British Association for the Advancement of Science
Liquid Crystals and Biology
Discovery of New Properties of Matter Assist the Study of the Secret of Life