THE new compressed air tunnel for aeronautical research at the National Physical Labortory, recently completed and now being brought into use, and the second one only in the world. a small tunnel on ...

THIS fine quarto volume furnishes a very valuable and comprehensive history of a system of tunnelling, especially under rivers and in water-bearing strata, which was inaugurated by Sir Marc Isambard ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...