414 SEC. 12. APPLIED MECHANICS. 



hole, and gives the required feed while the thread is cut by a small tool 

 carried in the slide rest seen at the side of the machine. The bar on which 

 the screw is to be cut is carried in the centres of a lathe, while the screw 

 machine is allowed to travel freely along the bed of the lathe. The bar is 

 removed from the machine so as to enable the knife edge inside to be seen. 

 When the circle and knife edge are set at the required angle they can be 

 clamped to the frame. Date 1800-1805. 



2127b. Three Guide Screws originated in the above 

 machine ; each screw contains 50 threads to the inch. The largest 

 screw is l^ in. diameter and has 3,144 threads in the entire length. 

 The nut for this screw is shown by its side ; it is 12 inches long and 

 has 600 threads. Maudslay, /Sons, and Field. 



2127c. Hand Plane for Metal, by the late Mr. Henry 

 Maudslay. Maudslay, Sons, and Field. 



2127d. A Metal Plough for Moulding, by the late Henry 

 Maudslay. Maudslay, Sons, and Field. 



2127f. Original Screw Cutting Lathe, made and used by 

 the late Henry Maudslay. It has 28 change wheels, and sector 

 frame for carrying an intermediate wheel for cutting left hand 

 screws. Four guide screws are shown, 100 threads, 50 threads, 

 35 threads, 30 threads to" the inch. Also a small cone chuck and 

 hollow mandril, screw tools for slide rest, and the original working 

 handle used by Mr. Maudslay, below the bed. Date 1800 to 1810. 



Maudslay, Sons, and Field. 



2127g. Skeleton Stocks and Dies, four sets, about 1805 to 

 1810, made and used by the late Henry Maudslay. The extreme 

 delicacy and finish of the work are worthy of notice. 



Maudslay, Sons, and Field. 



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

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



Maudslay, Sons, and Field. 



2135. Three Elliptical Guides. 



Royal Geological Institute and Mining Academy (Director, 

 Prof. Hauchecorne), 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. Hauchecorne), Berlin. 



2140. Spur Wheel Gearing. 



Royal Geological Institute and Mining Academy (Director, 

 Prof. Hauchecorne), Berlin. 



