302 



Molecular Effects of Solids. 



X... .-.2150- 



52 150. 1 : 8. 



52 156. 1 : 5. 



52 157. 1 : 6. 



52163 (52164). 1 : 8. 



52 165. 1 



52.150. Tribometer for Sliding Friction, Coulomb's, simpler than No. 52,149, Figure. . 1 



52.151. Apparatus for testing the Friction of Journals (Midler's) (M. T., Fig. 54), with bearings 

 of brass, iron and wood, each with a polished and an unpolished cylinder of iron jind 

 wood with sheaves for inserting 1 



52.152. Bicycle Ball Bearing (M. T., p. 94) o 



Adhesion Plates, of glass, Figure 52,156. 



List No. 52,153 52,154 52,155 52,156 

 Diameter of plates mm 80 120 150 2ou 



0. 12. 1. 2. 1. 5. 1. 13. 



52,157. Rubber Discs with handles, excellent in their action, Figure 1. 



52. 15X. Cylinder of Lead and Wax, for adhesion experiments (M. T., p. 51) o. 



52,15<t. Ivory Ball with Marble Slab, for elastic impact (W. IX, p. 136 [115]), ball 30 mm 

 diameter 



52,160. -- idem, with nickelled Iron Slab 



If the slali is breathed upon before the. experiment. :i plainly visible Mirtace is produced by tin- 

 foiling ball caused by the elasticity of the ivory ball. 



52.101. Percussion Trough, as .suggested by Tyndall, of wood, 1 m long, with levelling screws 

 ;ind 7 lignum vitae balls. Figure 



52.102. 3 Lead Balls and 3 Hardwood Balls with hooks, for impact experiments (M. T., p. 90) 



(]. :it;:i'.i. (748, U74, 



s. d. 

 1.0 



10.0 



lo.o 



5. 

 2.0 



