312 



Models of Machine Elements, Machine Parts and Machines. 



\n. .".'_ -2'2 I - 



arte-aeala. 



ErlirUr drj>un-l. Srnlr 



DarhBrrithaupt 



52 221, 51 452, 52 216, 51 676 51 631, 51 121. 1 : 14. 



52227. 1:3. 



52 228. 1 : 9. 



52230. 1:9. 



52 232. 1 : 8. 



52.221. Arrangement for Elasticity, Expansion and Breaking Tests, as suggested by Friedr. s d. 

 C. G. Miiller, for fitting to the lecture table, consisting of 1 screw clamp for securing 



the test wires and 1 guide pulley, also 6 test wires 1. 0.0 



The following are also necessary for the experiments: indicating cylinder No. 51,452, balance 

 pan No. 52,216, 1 set of weights Nos. 51,676 51,681 and 1 American screw clamp No. 51,121. For 

 measuring the expansion the test wire is simply laid over the axis of the indicating cylinder and not 

 slung round it. 



52.222. Batavian Glass Drops per dozen 0. 0.6 



52.223. Bologna Flasks per 10 0. 1.0 



52.224. Press (Reusch's), for producing sliding surfaces in calc-spar and rock salt, with pre- 

 paration 1. 5.0 



52.225. Pressed and Unpressed Preparations, singly 2 s. 6 d. to 0. 4. 



52.226. Press (Baumhauer's) for producing the calc-spar doublets 1. 4.0 



52.227. Hardness Scale (Mohr's), Figure, with large stone specimens, porcelain slab, 

 writing diamond and bar magnet, in wood box 0.18.0 



Models of Machine Elements and Parts and of 



complete Machines. 



Machine Elements and Simple Machines. 



52.228. Prism with its hollow mould, Figure, of wood, sliding on each other 0. 1<>. u 



52,22!. Shoe Guide, Figure, of wood 0. 12.0 



:>2.2.'50. Journal with bearing, Figure, of wood, with 2 turning surfaces fitting in each 



other ' | 0.12.0 



52.231. Circular Groove with Circular Slot (incomplete journal), of wood 0.18.0 



52.232. Bolt and Nut, Figure, of wood 0.18.0 



ci. :.T.M. 3i:>-'. 

 514, M:.. 614, 'i 



