45, CORNHILL, B.C., AND 122, REGENT STREET, W., LONDON. 



491 



FIG. 3021. 



MECHANICS AND DYNAMICS 



The Models, &c., detailed in this section will be found valuable aids to the 

 teacher and student in studying the laws of motion and the science of Mechanics. 



Each. 



3020 Model Apparatus for exhibiting and illustrating the 



properties of the Mechanical powers, viz., levers, 

 simple and compound, pulleys of different kinds, 

 wheel and axle, inclined plane, screw, wedge, capstan, 

 &c., in mahogany and boxwood ; in case, with weights 

 complete ......... 



3021 Mechanical Powers, more highly finished, and com- 



plete with Brass pulleys, &c. (fig. 3021) . 



3022 Sets of Levers, comprising the three orders, and the 



bent form ......... 



3023 Ditto ditto in Brass 



3024 Systems of Pulleys, Simple and Compound . 



3025 Inclined Plane, with Carriage and Weights 



3026 Models, to show the formation of the Screw and Nut, to 



illustrate the action of screws of different degrees of 

 inclination, the endless screw and compound screws . 



3027 Adhesion Plates, of Glass, with handles 



3028 Inertia Apparatus, with Brass ball, mounted on a stand 



3029 Apparatus for showing the impenetrability of matter . 



3030 Apparatus for determining the Centre of Gravity of 



variously shaped bodies 



s. a. 



Each. 

 s. 



5 10 



10 10 21 



220 



15 



110 



10 

 5 

 2 



10 



5 5 



15 



1 10 

 5 



1 10 



