478 SEC. 12. APPLIED MECHANICS. 



2077. Bates' Anaglyptograph. Machine for producing 

 drawings or etchings in relief from models, coins, medals, &c. 



George Hogarth Makins. 



The machine consists of two portions : The first, a solidly framed oblong 

 base, In which is fixed a long double screw, right-handed at one and left- 

 handed at the other half, and of 20 threads per inch ; rotation of this gives 

 opposite motion to two tables, upon the front one of which the object to be 

 copied is fixed, and upon the other the plate to receive the etching or draw- 

 ing. At the winch end of the screw is fixed a wheel cut with 100 teeth, and 

 also a stop arrangement by which any number of the teeth can be taken, and 

 thus equal partial turns given to the screw. 



The second portion of the machine is a framed apparatus carrying the 

 tracing and etching points. This is provided with wheels for travelling 

 across the base, and a groove is formed in the latter for their direction. The 

 tracing point is attached to a bar which in rising does so at an angle of 45. 

 In the centre of the bar is a piece which, being between friction wheels 

 attached to the diamond or etching point frame, will, as the bar rises by pass 

 ing over any elevation in the object, cause the diamond frame to move at 

 right angles to the motion of the machine, and thus the line forming is curved 

 or waved just in proportion to the height of the elevation passed over ; hence 

 the appearance of relief given to the etching. 



2078. Model of a Steam-boiler to show Herschel's boiler 

 arrangement. Bock and Ifandrick, Dresden. 



2079. Model of Valve Motion, to show the link motion of 

 Steplienson, Gooch, and Allan. Sock and Handrick, Dresden. 



Model of Reversing Gear. Bock and Ifandrick, Dresden. 



2080. Drawing of a Model for testing the Link Motions 



of Stephenson, Gooch, and 'Allan, for locomotive manufactories. 

 Greatly improved and quite new construction. 



Bock and Ifandrick, Dresden. 



2081. Model, for the demonstration of Centroids. 



Bock and Ifandrick, Dresden. 



2082. Model of a higher pair of Elements. 



Bock and Ifandrick, Dresden. 



2083. Vierkurbelkette. (Four crank-chains.) 



Bock and Ifandrick, Dresden. 



2083a. Slider Crank Chain. 



Bock and Handrick, Dresden. 



2083b. Mechanism of Slider Crank Chain. 



Bock and Ifandrick, Dresden. 



2084. Model of a Hanger. Bock and Ifandrick, Dresden. 



2085. Model of a Wall Bracket. 



Bock and Jfandrick, Dresden. 



