--1 illustration.
Spectrum of the Sun and Elements.
Allotropic Forms of Metals.
IV. HYDRAULICS.--The Power of Water, or Hydraulics Simplified.
--By G.D. HISCOX.--Current wheels for power and raising water.
Interesting presentation of this practical portion of the subject.
--4 illustrations.
V. MECHANICAL ENGINEERING.--Compressed Air Production.--
By WM. L. SAUNDERS.--A Sibley College lecture, giving full
elaboration to this important subject.--The various forms of
compressors and general features of the service.--18 illustrations.
Improved Pneumatic Hammer.--A suspension hammer capable
of delivering 500 blows per minute.--8 illustrations.
The Thermic Motor of the Future?--A remarkable exposition of
the possibilities of the gas engine.--Recent experiments under M.
Aime Witz.--2 illustrations.
VI. MEDICINE AND HYGIENE.--The Electrical Purification of
Sewage and Contaminated Water.--By WM. WEBSTER.
VII. NAVAL ENGINEERING.--The New German Dispatch Boat
Meteor.--A German built war vessel of great speed.
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