MOTION, MECHANICS, ETC. 1] 



No. 



Time glasses, two hour, in plain frame, 

 $1.75; polished rosewood, - - - $ 3.00 

 231 Time glasses for medical men in examining 



the pulse, half minute, - -- - - 1.00 



MOTION, MECHANICS, <fec. 



232 Fig. 144, inertia apparatus, 1.50 



233 Fig. 145, pair of glass adhesion plates with 



handles, - - *VB - - ^f- !- 50 



234 Fig. 146, Bohnenberger's machine, - ;- - 5.00 



235 Fig. 147, apparatus for illustrating impene- 



trability, - - :: * 1.00 



236 Fig. 148, set of tubes mounted, for showing 



capillary attraction, '"*;* - - 1.00 



237 Fig. 149, pair of glass plates for capillary at- 



traction, 1.50 



238 Fig. 150, collision balls, set of five in ivory, 



four sizes, - $1.25, 2.00, 3.00 and 4.50 



239 Fig. collision balls mounted on frame with 



arch, - $7 to 12.00 



240 Fig. 150, set of five boxwood collision balls, 1.00 



241 Fig. 150, set of five boxwood collision balls, 



and frame with arch, $3.50 to 7.00 



-242 Fig. 151, machine for showing the composi- 

 tion of forces, - - 5.00 



243 Fig. 152, rocking horse for illustrating the 



centre of gravity, ----- 1.00 



244 Fig. 152, a pair of mahogany blocks -with 



wires for centre of gravity, - - - 1.00 



245 Figs. 153 to 157, set of mechanic powers, 

 with graduated framework, six systems of 

 pulleys, wheel and axle, levers of first, 

 second, and third order compound levers, 

 bent levers, screw with lever inclined 

 plane with graduated arch, carriage wedge 

 in two parts, and a set of brass weights, 35.00 



