Vlir. MACHINERY. 485 



2127h. Coining Machinery. A cutting-out press for blanks, 

 <vith self-acting feed rolls to deliver fillet. Date about 1814. 



Maudslay 9 Sons, and Field. 



297a. Micrometer Gauge and Screw, unfinished ; divisions 

 adjusted to show yui^o tn ^ an inch. 



Maudslay, Sons, and Field. 



297b. Micrometer (Screw) Gauging Machine, by the late 

 Mr. Henry Maudslay, divided on the head of micrometer screw to 

 show T^r<roi)th ^ an i ncn ' Maudslay, Sons, and Field. 



2178go. Drawing of Machinery for Boring Cannon, 



for Rio Janeiro, 1813. Maudslay, Sons, and Field. 



2135. Three Elliptical Guides. 



Royal Geological Institute and Mining Academy (Director, 

 Prof. Hauchccorne), Berlin. 



2138. Elliptic Guide, with long radius bar. 



Royal Geological Institute and Mining Academy (Director , 

 Prof, Hauchecorne), Berlin. 



2139. Approximate Elliptic Guide. 



Royal Geological Institute and Mining Academy (Director -, 

 Prof. Hauchccorne), Berlin. 



2142. Kinematic Pillar Vice, with triangular link-motion. 

 Royal Geological Institute and Mining Academy (Director, 



Prof. Hauchecorne), Berlin. 



This stand is so arranged that any link of the kinematic chains can be 

 fastened in it easily and securely, so that they can be shown in every possible 

 position. 



WHEEL GEARING. 



2140. Spur Wheel Gearing. 



Royal Geological Institute and Mining Academy (Director, 

 Prof. Hauc/iecorne), Berlin. 



2143a. Model of a Machine for Cutting the Teeth of Bevel 

 Wheels. F. En gel, Hamburg. 



In the usual cutting and planing machines for bevel wheels, each space 

 between the teeth is produced by at least two operations ; first one side of a 

 tooth is shaped or planed, then the opposite side of the next tooth. The 

 present machine cuts both profiles simultaneously with the same cutter. A 

 lateral motion is communicated to the cutter, the axis of the tool oscillating 

 about the cutting point of the conical surface, and working alternately the 

 one and the other side of the tooth profile, while the feed of the tool is 

 self-acting. The machine is more accurate than previous ones, and other 

 kinds of wheel can be shaped with it. 



2143b. Samples of Wheels which have been cut by the 

 Machine. F. Engel, Hamburg. 



