VI. MACHINERY. 413 



2122. Working Drawing, on a \ scale, or 6 inches to 1 foot. 

 Pillar or plummcr block for a 4^-inch shaft or journal. 

 Various sections. Sheet 2. 



South Kensington Museum. 



2123. Working Drawing, on a \ scale, or 3 inches to 1 foot. 

 Hanging bracket and pillar block, for a 31-inch shaft; at- 

 tached to a 16-inch cast-iron girder. 



Front and side elevations. South Kensington Museum. 



2124. Working Drawing, full size: Steam whistle. 

 Elevation. Plan. Sections. 



The vertical section shows by arrows the passage of the steam 

 through the whistle. 



South Kensington Museum. 



2125. Working Drawing, on a J scale, or 3 inches to 1 foot. 

 Movable head stock for a turning lathe. 



Side elevation, plan, and section. 

 End elevation and section. 



South Kensington Museum. 



2126. Working Drawing, full size. 

 Water cock or tap. 



Side elevation. End elevation. 

 Plan. Side and end elevation of plug. 

 Through section of tap. 



South Kensington Museum. 



2127. Working Drawing, on a scale, or 8 inches to 1 foot. 

 Stop-cock or straightway cock, for steam or water. 



End elevation. Side elevation. Plan. Two sections. 

 Fourteen working drawings (lithographs), parts of machinery 

 and steam engines. Thomas Busbridge, Plumstead, S.E. 



South Kensington Museum. 



2127a. Machine for Originating Screws, with micrometer 

 adjustment applied to tangent screw which sets the guide at any 

 angle suitable to required pitch (adjustable to T -J^ degree). The 

 cutter is carried in sliding rest. Specimens of screws originated in 

 machine. Maudslay, Sons, and Field. 



2127aa. Machine for Originating Screws of any re- 

 quired pitch and diameter (by the late Mr. Henry Maudslay). 



Mauds lay, Sons, and Field. 



Inside the cylindrical hole (below the table) is a steel knife edge which is 

 attached to the divided circle (above). This circle and knife edge can be ad- 

 justed by a micrometer tangent screw to the calculated angle of the thread. The 

 knife edge presses on and nets as a guide to a cylindrical rod passed through the 



