22
PNEUMATICS.
£
Condensing ditto . . . . . 10s. to 1
Syringe, with lead weight . . . . . 0
Syringes, for obtaining fire by the compression of air
. . . . . . . 7s. 6d. to 2
The Mag-deburgh hemispheres, proving the weight of
the atmosphere ...... 1
Guinea and feather apparatus, demonstrating the resistance of the air, with one, two, or three falls . . . . . . . 18s. to 2
A set of windmills, for the same use . . .1
A balance beam and stand ..... 0
Flasks, mounted with caps and stopcocks, for the specific gravity of the gases . . 1 Os. to 1
Model of a water pump, with glass barrel shewing the
principle, and absurdity of the term suction . 1
Improved forcing ditto, for a constant stream . . 3
Ditto, combined on stand . . . . .4
De la Hire’s pump. . . . . £4 to 6
Six breaking squares, cap and cage . . . 0
Hand and bladder glasses ... 4s. 6d. to 0
Single transfer plate and pipes, for fountain in vacuo 1 Lead weights, bladder, and stand, shewing the elasticity of air . . . . . . .0
Glass vessel, for fountain in vacuo . . . . 0
Fountains of copper, with syringe, and various jets,
fan, &c. ... £5 15s. 6d. to 10
Glass, with bladder, shewing the action of the lungs . 0
The torricellian barometrical experiment . 12s. to 1
Leslie’s apparatus, for freezing water by evaporation
over sulphuric acid . . £1 Is. to 3
Marcet’s apparatus, for freezing mercury by the evaporation of sulphuret of carbon . . . 0
Flask, with stopcock, &c. for exhibiting the boiling of
water, by the application of cold . . . 0
s. d. 10 0 10 6
0 0
10 0
0 0 14 0 7 6
0 0
10 0 3 0
14 0 0 0
10 6 7 6 1 0
17 0
5 6
10 0
6 6 0 0
3 0
15 0 10 0