Page 56
A P PA R A TU S FOR E L E C T R IC L IG H T IN A VACUUM
i A glass cylinder of 2 inches diameter, length 57 inches,
f 2 A glass cylinder of 4$ inches diameter, length 40 inches,
t 3 A glass cylinder of 5 inches diameter, length 80 inches, consisting of two
cylinders.
•j- 4 A tube of 1 inch diameter, length 48 inches.
5 A tube bent in a spiral and placed upright.
6 A glass sphere on a base, with its apparatus by J . Cuthbertson, according to
his description, volume i.
7 A bell-jar in which is suspended a horizontal ring, beneath which is placed
a point. . .
8 A bell-jar in which are horizontal and vertical rings with points placed in
their centres.
9 A bell-jar with a knob from the top and a large hemisphere on the plate.
10 A bell-jar covering a small bottle, which is filled with water, on a brass plate
+ 11 A bell-jar covering a small, evacuated bottle.
12 A bell-jar in which is a ball on a sliding rod to position it at different heights
above the plate.
j" 13 Two small bottles, evacuated.
14 Two evacuated tubes in which is phosphorus of Canton.
15 Two double barometers according to Wilson, to demonstrate the difference
between the light of out and ingoing electric streams in rarefied air, Phil.
Trans......
Page 57
A P PA R A TU S FOR E L E C T R IC CH A R G E
i The apparatus of De Luc, consisting of an isolated plate, two isolated brass
plates and electrometers, used to demonstrate the nature of the electric
charge, De Luc’s Idees sur la meteorologie [sic\.
t 2 A glass divided into two bottles by means of a partition.
■f 3 Two coated jars, which can be placed on one another, and for this in one of
them the knob is replaced by a brass plate.
4 An isolated small mahogany table, on which to place a bottle.
5 An electrometer, consisting of 2 knobs on horizontal arms, which can be
positioned a certain distance apart; to allow to be placed under it bottles of
different sizes and shapes, to test the time taken to charge to a certain level.
6 An electrometer of Kinnersley to compare the strength of shocks.
Page 58
TO U RM AL INE
t i The large powerful tourmaline of ... inches diameter,
j" 2 ... similar tourmalines, not so powerful.
"]■ 3 A powerful tourmaline of ... inches diameter.
4 A small table with some small silver apparatus with which to do experiments
with the tourmaline.
Page 59
FOR TH E E F F E C T S OF L IG H TN IN G
t i A wooden facade, on which is placed on the one side a coated and on the
other a glass plate sprinkled with bronze powder, with which to imitate all
the phenomena and effects of lightning, according to the improvement of
M. van Marum described in the Verhandeling van ’t Bataafsche Genoot-
schap, volume vi.
2 A wooden facade, being the model of the Utrecht gate in Amsterdam, from
which, by means of the electric discharge, several pieces are thrown out.
3 A model of a ship of which the mast is shattered by means of an electric discharge.
4 An apparatus with which to conduct the electrical discharge or artificial
lightning through and over various bodies.
5 Another one with which to break pieces of glass, to calcinate metals, etc.
Page 60
E L E C T R IC A L A P PA R A TU S OF VAR IO U S SORTS
I i A glass tube and a lacquer rod, to investigate the different forces of the same,
obtained by rubbing.
| 2 A glass tube coated with small pieces of tinfoil, enclosed in another glass
tube, to conduct through it the electric discharge.
f 3 A glass tube, in which can be placed at different distances 2 knobs, to investigate
the conductivity of air at different temperatures.
f 4 A glass tube and tap, in which the air can be compressed, to drive out a jet of
water, by which the glass can be charged.
5 A small glass, in which is ignited, by means of an electric spark, a mixture of
inflammable and atmospheric air.
f 6 A thick-walled glass tube with a brass tap, to investigate the fusion of metals
in different sorts of air.
| 7 A glass on a tap, the top of which is provided with a sliding rod, used for the
same.
Page 61
E L E C T R IC A L COLUMN OF VO L TA
| i 200 square copper and 200 zinc plates, each being 25 square inches, and
further apparatus with which to construct the electrical column, described by
M. van Marum in the Annales de Chimie, tome 40 page 289 See K[onst]
& Letter Bode 1801—II.
f 2 300 round copper, and 300 zinc plates of ... inch diameter and two wooden
frames in which the constructed electrical column is isolated.
Page 62
LO D E S TO N E -FO R C E
f i A small box in which is a complete apparatus to indicate the properties of
lodestone-force, by G. Adams.
f 2 A small lodestone weighing ... grains, which carries ... grains.
3 An armed lodestone, suspended in a wooden frame, lifting over 50 pounds.
4 A large armed lodestone, suspended in an iron frame, lifting 200 pounds.
5 An artificial magnet, consisting of six horizontal bars lying on each other
fixed in brass.
6 An artificial magnet, consisting o f ... bars in the shape of a horseshoe, placed
against one another and fixed in brass, lifting over 30 pounds.
7 2 bar magnets, length ... inches.
t 8 2 bar magnets, length ... inches.