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



473 



FIG. 2825. 



FIG. 2876. 



FIG. 2879. 



FIG. 2878. 



FlG. 2886. 



s. a. 



2875 Student's or Laboratory Standard Barometer . 550 



2876 Observatory Standard Barometers, with mounting 



board (fig. 2876) See also pages 4 and 5. . . 8 8 10 10 



2877 Guinea and Feather Apparatus, 3 falls .... 1 10 



2878 Ditto ditto 2 falls (fig. 2878) without the glass 



receiver 18 6 



2879 Guinea and Feather Tube to demonstrate the law that 



In a vacuum all bodies fall with equal velocity (fig. 2879) 1 16 



2880 Model, for showing the principle of the common water 



pump 150 



2881 Model, for ditto, with glass barrel (fig. 2881), without 



the stand 1 12 6 



2882 Model of Forcing Pump (fig. 2882), ditto . ' 2 15 



2883 Models of Lifting and Forcing Pumps, mounted on 



mahogany stands, with water cistern . 550 



2884 Model to illustrate the arrangement and construction 



of Manual Fire Engines 660 



2885 The Baroscope, an apparatus consisting of balance beam on a stand, a ball of 



cork suspended at one end, and a metal weight at the other, illustrating 



that two bodies balanced in the atmosphere are not so in a vacuum 



(fig. 2885) 15 



