Page 34
MOISTURE OF ATM O S PH ER IC A IR
t 1 A11 apparatus to show that atmospheric air takes on more or less moisture
depending on whether it is warmer or colder, consisting of two large, well-
sealed bottles that are plunged in a tin trough full of hot water,
f 2 A hygrometer of human hair, according to the construction of Saussure, by
Guthbertson [te Amst. deletedj|
3 A hygrometer of whale-bone, according to De Luc, by Haas of London.
4 A similar, smaller one, to be placed under a receiver glass.
f 5 A hygrometer of whalebone by Cuthbertson [te Amst. deleted].
6 A hygrometer, working by impregnating paper with sal. tartari, with a needle
and a scale, by Wiekera [te Amst. deleted].
Page 35
R E S P IR A T IO N
t 1 A glass, in which a bladder, and around which, underneath, is wound a
bladder, to show that by drawing down the diaphragm \middenrifl, air is
breathed in.
f 2 A meshed dome of copper wire on a wooden ring, under which animals are
placed on the plate of an air-pump,
f 3 A glass to place fish on the air-pump.
Page 36
P U R IF IC A T IO N OF A TM O SPH ER IC A IR
t i A model of the ventilator of Hales.
2 A model of the ventilator of Desaguliers.
T 3 The vent-tube of De l’Isle de St. Martin, improved by a lamp placed in it.
Page *36
WINDS
t i A wind-meter according to Bouguer, Traité de la Navire, pag. 359, Verhand.
van de Holl. Maatsch., iii, 3 pag. 234.
Pa ge 37
A EROM E T ER S , GASOMETERS
1 A gasometer or aerometer, working by means of syphons described in the
Verhandelingen van Teylers Genootschap, x, p. 1 (in the Chemistry Laboratory)
.
2 Two similar gasometers of a simpler construction, ibid, x, p. 24, V, fig. 1.
t 3 A similar gasometer and an apparatus to receive the produced oxygen, or
other sorts of gas.
Page 38
A P P A R A TU S FOR E X P E R IM EN T S ON D IF F E R E N T SORTS OF GAS, W H ICH
CAN O N LY BE T R A P P ED B Y MERCURY
t 1 Two stone troughs, which hold about 300 lbs. of mercury, to collect those
types of gases that are absorbed by water,
f 2 Glass bell-jars and cylindrical glasses of 34 inches diameter, fitting in the
hollows of the stone mercury troughs.
t 3 Two wooden troughs arranged for the filling of smaller glasses with mercury,
and the receiving of gas in the same.
t 4 Cylindrical glasses of different diameters for these wooden mercury troughs,
t 5 Small glass bottles of different sizes with ground stoppers, to which are fixed
curved tubes arranged to bring the different sorts of air, produced from
different substances by heat, in the glasses on the mercury troughs.
Page 39
A P PA R A TU S FOR E X P E R IM EN T S ON D IF F E R E N T SORTS OF GASES W H ICH
CAN BE T R A P P ED B Y W A T ER
j" i Two large wooden water troughs, covered with lead on the inside, and two
smaller water troughs with tin.
f 2 Glass bell-jars and cylindrical jars of different sizes, to receive the sorts of air
and to stand above water.
I 3 Cylindrical bottles of different sizes, with ground stoppers with curved tubes,
for the different sorts of air produced in them under the glasses on the water-
trough.
f 4 A similar bottle with ground stopper and tube, on which is a glass funnel with
the pipe closed by a stopper, used to allow the vitriolic acid to pass through in
small quantities, for the production of carbonic acid gas from chalk.
f 5 A similar bottle with ground stopper and tube, on which is a funnel-shaped
glass enclosed at the top with a glass stopper for similar use.
f 6 The glass apparatus of Dr. Nooth to saturate water with carbonic acid gas.
f 7 The apparatus of Dr. Stipriaan Luiscius used for the same.
Page 40
COMBUSTION OF H YD RO G EN IN O X YG EN AND O TH ER A P P A R A TU S TO
DEMONSTRATE TH E COMPOSITION OF W A T ER
1 The apparatus for making, in a simple manner, very accurate experiments
concerning the composition of water, described in Verhandelingen, x, I, II,
p. 1.
2 The simpler apparatus for the experiment concerning the composition of
water, Verhandelingen, x, III, IV, p. 24 (in the laboratory).
f 3 The smaller apparatus of similar construction, being also arranged for the
decomposition of the gas Hydrogène Carboné, Verhandelingen, x, V, fig. 3,
p. 36.
4 The apparatus with which one used in the past to show the production of
water by the ignition of a mixture of hydrogen and oxygen in a glass sphere,
by means of an electric spark. With this two cylinders with scales to allow
both sorts of gas into the sphere in the right proportions.
f 5 The apparatus for the decomposition of water, being the same as that also
used for the decomposition of spirits of wine, Verhandelingen, x, X.
Page 41
TH E E F F E C T S OF C A LO R IC
Expansion of Bodies by Heat
1 A brass ball fitting in a ring, which, when heated by boiling water, cannot
fall through it.
2 A pyrometer, with it some rods of different metals.
t 3 A glass tube on a brass scale, which is placed in a brass trough on an oblong
fire-trough, to show the expansion of liquids by the heat of boiling water.
t 4 Two small bottles, one with a straight and the other with a bent tube screwed
into the neck, to show the expansion of glass by the heat of boiling water ; see
Nollet, [iv], leçon 14, I, fig. 1, 3.