VI. MACHINERY. 405 



2056. Diagrams illustrating the principles adopted in con- 

 structing Wood-planing Machines. These diagrams are used 

 in lectures on Applied Mechanics at the I. and R. High School of 

 Agriculture and Forestry, Vienna. 



Dr. William Francis Exncr, Vienna. 



In 'the forestry section of the above school, series of lectures on the 

 mechanical technology of wood-working are delivered annually. These are 

 frequented by foresters who wish to become qualified for the post of manager 

 of wood-working establishments. For these lectures diagrams of all sorts of 

 tools and machinery for wood-working are prepared. The examples shown 

 form only the first part of the series. 



2057. Model of Lever Plough, with 6 shares, for plough- 

 ing by steam. (Fowler's system, reduced to one-tenth.) 



M. Digeon, Paris. 



2059. First Type-distributing Machine, invented by 

 Alexander Mackie. John Maclauchlan. 



2O59a. Coining Machinery A Cutting out or Punching 

 Press, with self-acting feed and rollers for carrying the fillets. 



Maudslay, Sons, and Field. 



2060. Drawings of the air compressors on the Colladon 

 system, employed in boring operations at the St. Gothard. 



Professor Daniel Collation, Geneva. 



2061. Models, Twenty-seven, for teaching machinery, exe- 

 cuted by M. Schroder, of Darmstadt. Prof. Pigot, Dublin. 



PUMPS. 



2062. Model of Force Pump. 



Prof. W. F. Barrett, Dublin. 



2063. Model of Ordinary Water Pump. 



Prof. W. F. Barrett, Dublin. 



1989. Model of Sand Pump. 



Council of King's College, London. 



1989a. Air Water Pump, by Jagn. 



R. Nippe, St. Petersburg. 



2064. Model (to scale) of Centrifugal Pump. 



Lawrence and Porter. 



This pump has been patented by Messrs. Lawrence and Porter. The chief 

 feature of the patent is the arrangement of making one side of the casing 

 removable. The advantages of this system are as follows : By taking off the 

 movable side, the disc or " fan " can readily be examined or removed in a few 

 minutes without in any way disturbing or interfering with the suction or 

 delivery pipes. This is found in practice to be a very great advantage. 



