No. 52211. 



Machine Elements, Simple Machines, Screw Gears. 



313 



52 237. 1 : 6. 



52 238. 1 : 6. 



52 239. 1 : 0. 



52 241. 1 : 6. 



52 240. 1 : 6. 



r>2.233. Triangular Screw Thread with Nut cut through, Figure, of wood ..... 



52,234. Square Screw Thead, with Nut cut through, Figure, of wood 0. 3. 



s. d. 

 0. 2.6 



52,235. Model of Screw with 4 threads of different shape and pitch, without nuts, of metal, 



Figure 



52,236. Simple Machines, Figure, Wedge, Windlass, Capstan, Toothed Gearing with fly- 



wheel, Worm Gearing and Screw Jack, mounted on one baseboard. 



Gearing with Screws, Cranks, Links, Rods, Joints and Discs. 



52,237. Fixed Nut with Rotary Screw Spindle, Figure, with angular, accurately turned 



thread, constructed entirely in iron 

 :>-. 238. Fixed Screw Spindle, with Rotary Progressive Nut, Figure 



1.10.0 



4.15.0 



1. 0.0 

 1. 4.0 



52.239. Screw Spindle, rotary, resting immovably in its bearings, with straight guided, pro- 

 gressive nut, Figure 1.10.0 



52.240. Rotary Nut, incapable of lateral movement, with straight guided, progressive screw 

 spindle, Figure 



52,241. Screw with Right-and-Left-Handed Thread, Figure, with nuts 



1.10.0 

 2.10.0 





Apparatus for showing the formation and mode of 

 action of the screw, see No. ~>l,i)05 51,910, p. 273. 



C1.518.M9, 8788, 621,8787, 



5805, 3788, 520, 3789. 



