M ETF.OH 01,0 GY.
23
£
Filtering cup, shewing the porosity of vegetable bodies 0 Plate and piece of wood, for the same experiment . 0
The double transferrer, which transfers a vacuum from
one receiver to the other . . £2 to 3
Flat plate, with sliding wire and collars of leather . ' 0 Ground plate, brass box, and iron heater, for experiments on gunpowder in vacuo . . .1
Hollow glass figures, for rising and falling in water,
according to the rarefaction of the air, 3s. to 0 Large bell ground receivers, for air pumps . 15s. to 1
Small ditto . . . . . . 5s. to 0
Long fountain glasses . . . 14s. to 1
Guinea and feather receivers . . . 18s. to 2
Receivers, ground at each end, or made to pattern or order ........
METEOROLOGY.
Complete set of meteorological instruments, consisting of best iron cistern barometer, two thermometers for registering the maximum and minimum of temperature, parabolic radiating mirrror with thermometer, Daniel’s hygrometer, with printed instructions and tables, rain gauge and evaporating ditto, with glass measure, as recommended by L Howard, in his climate of London ..... £15 15s. to 21
Standard barometer, with open cistern, as made by J. N. for the Royal Society, and described in Mr. Daniell’s Meteorological Essays . . 20
Portable ditto, with corrections, and every requisite
for keeping a correct register . . .8
Sir H. Davy’s compensation barometer, with iron cistern . . . . . . . .10
Newman’s portable mountain barometer, with iron cistern, and printed instructions . . .6
s. d.
5 0
4 6
0 0 12 6
10 0
5 0 15 0 10 0 10 0 10 0
0 0
0 0 8 0 0 0 6 0