492 



NEGBETTI AND ZAMBRA, HOLBOEN VIADUCT, B.C., 



FIG. B. 



FIG. A. 



FIG. 3044. 



3031 



FIG. c. 



s. d. 



Apparatus illustrating that the stability of a body 

 depends upon the centre of gravity, see also No. 2934 

 3032 Double Cone and Inclined Plane, to show the descent 

 of the centre of gravity, although the cone apparently 

 moves upwards . . . . . . . . 10 6 



s. d. 



12 6 



16 



FIG. 3034. 



3033 Apparatus for illustrating the Parallelogram 



of Forces, with weights, &c., of the best 



finish, complete . . . . .660 



3034 Attwood's Machine for demonstrating the 



laws of falling bodies, with pendulum 

 beating seconds, weights, &c., complete on 

 stand, with best Clock and highly finished 

 (fig. 3034) 25 



3035 Ditto ditto simple form . . . 12 12 



3036 Apparatus to show that a body takes the same 



time to descend the diameter or chord of a 

 circle, whatever the length of that chord 

 maybe 220440 



3037 Apparatus to illustrate that the time required 



for the descent of bodies down an inclined 



plane is proportionate to its length 220550 



3038 Apparatus to illustrate the Composition of 



Force % 3 



3039 Apparatus to demonstrate that the time 



required for a falling body to reach the 

 ground is the same, whatever be the force 

 of projection . . . .330550 



