--Ingredients of
fuel.--Potential energy of fuel.--With 7 figures and
several tables
Planetary Wheel Trains.--Rotations of the wheels relatively
to the train arm.--By Prof. C.W. MACCORD
The Pantanemone.--A New Windwheel.--1 engraving
Relvas's New Life Boat.--With engraving
Experiments with Double Barreled Guns and Rifles.
--Cause of the divergence of the charge.--4 figures
Improved Ball Turning Machine.--1 figure
Cooling Apparatus for Injection Water.--With engraving
Corrugated Disk Pulleys.--1 engraving
III. TECHNOLOGY.--A New Standard Light
Dr. Feussner's New Polarizing Prism.--Points of difference
between the old and new prisms.--By P.R. SLEEMAN
Density and Pressure of Detonating Gas
IV. ELECTRICITY, LIGHT, ETC.--Early History of the Telegraph.
--Pyrsia, or the system of telegraphy among the Greeks.
--Communication by means of characters and the telescope.
--Introduction of the magnetic telegraph between Baltimore
and Washington
The Kravogl Electro Motor and its Conversion Into a Dynamo
Electric Machine.--5 figures
Bornhardt's Electric Machine for Blasting in Mines.
--15 figures
Pritchett's Electric Fire Alarm.--1 figure
A Standard Thermopile
Telephonic Transmission without Receivers.--Some of the
apparatus exhibited at the annual meeting of the French
Society of Physics.
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