No coin nor oath required. For personal study only.
&ward of Prizes,--The Annales des Ponts et Chaussdes, for Jan., 1877, announces the following awards, made Dec. 16, 1876, to the authors of the best memoirs published in the Annales in 1874, viz. :
Gold medal of 600 francs to M. Hirsch, for his " Theory of aerothermie engines."
Three gold medals of 500 francs: 1. To M. Maldzieux, for his "Report on the English Railways in 1873."
To M. Choron, for his "Note upon the calculation of the bending moments and the flexures in straight metallic beams with many bays."
To M. Mal6zieux, for his "Memoir on foundations by compressed air.
Two honorable mentions : 1. To M. Schlemmer, for his "Notes on the present state of jurisprudence in the matter of setting the limits of water courses in the public domain."
C.
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## News update Diffusion cooled laser A 2 kW diffusion cooled CO:! slab laser, designated the DC020, has recently been launched by Roiin-Sinar Laser. The laser is the result of a project which aimed at developing a new generation of high power CO2 lasers. Due to their fundamental design principle