45, CORNHILL, E.G., AND 122, EEGENT STREET, W., LONDON. 



493 



FIG. 2694. 



FIG. 3049*. 



Each, 

 s. d. 



220 



3040 Apparatus to illustrate the curve of quickest descent 



3041 Ditto to show the Parabolic Curve described by a 



projectile 



3042 Ditto to illustrate the laws of Impact collision or per- 



cussion, with divided arc and ivory balls (fig. 3042) 



3043 Ditto to illustrate the Equilibrium of Forces, complete 



3044 Whirling Table or Centrifugal Machine and 



Apparatus complete, for illustrating the laws of 

 Central Forces (fig. 3044, A, B, c.) 



3045 The Whirling Table only, without apparatus. This 



can be used for Tyndall's experiment, No. 2954, 

 page 483, for producing Heat by Mechanical Action or 

 friction 



3046 Model to illustrate the construction and properties of 



an Arch 



3047 Model to show the properties of crown, spur, and bevel 



wheels, wheel and pinion, and rack and pinion '. 



3048 Model to demonstrate the properties of Steelyard and 



Balance 11 



3049 Model of Capstan or Windlass 1 10 



3049 Model, to demonstrate the principle of the Wedge- 

 Metal Wedge and rollers in Mahogany Frame (fig. 3049*) 



3050 Glass Models, for teaching Geometry and Crystallography 



3051 Small Sets of Geometrical Solids and Planes 



3052 Larger Sets of ditto, with sections of the Cylinder, Cone, 



and Sphere 



3053 Professor Maxwell's Dynamical Top, for illustrating 



the phenomena of rotation, complete in Mahogany 

 Box 



3054 The Gyroscope, for description and price see page 495. 



Each. 

 s. d. 



330 



220 



330 

 660 



21 



660 



220 

 660 



2 2 .0 

 220 



3 10 



220 



10 6 



1 10 "0 

 6 10 



