1
sung.“, 1838: „in den untern Räumen des Cabinets“, 1849: „Weber“; (Inv.
1
Exp.-Physik; H3, Bl. 9v): „155. eine mit Stanniolblättchen belegte Glasröhre
2
mit Messingfassung“, dabei Vermerk mit Bleistift (1866 Kohlrausch ?):
3
„Vorrath“.
4
Der Anzahl der Bestätigungsstriche bei Mayers Revision 1799 (Q2) zufolge
5
waren zwei derartige Objekte vorhanden. – Zu diesem Versuch vgl. ErxH,
6
562,8 – 19.
7
Adams (Essay 1784, 71 f. u. Fig. 31 f. [BL 580]) hat für dieses Experiment
8
folgende Varianten genannt: „EF, fig. 31, is a glass tube, round which, at small
9
but equal distances from each other, pieces of tin-foil are pasted in a spiral form,
10
(hence it is called the spiral tube) from end to end; this tube is inclosed in a larger
11
one, fitted with brass caps at each end, which are connected with the tin-foil of
12
the inner tube. Hold one end in the hand, and apply the other near enough to the
13
prime conductor to take sparks from it, a beautiful and lucid spot will then be
14
seen at each separation of the tin-foil; these multiply, as it were, the spark taken
15
from the conductor, for, if there was no break in the tin-foil, the electric fire
16
would pass off unperceived. […] The Luminous Word. – This experiment is
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exactly on the same principles as the foregoing. The word is formed by the small
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separation made in the tin-foil, which is pasted on a piece of glass, that is fixed in
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a frame of baked wood, as is represented in fig. 32. To make the experiment, hold
20
the frame in the hand and present the ball G to the conductor, the spark received
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on this will be communicated to the tin-foil, and follow it in all its windings, till
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it arrives at the hook h, and is conveyed from thence to the ground by a chain: the
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lucid appearance at each break exhibits a word in characters of fire.“
24
25
289§. 523. Hieher gehören die 3. Elektrische Pistolen und die
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Elektrische Lampe ein vorzügliches Instrument.[9 Rthl]
27
Vgl. zu den drei elektrischen Pistolen Nr. 139 – 141 und zu Pistolen und Lampe
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VNat 4, 735 – 737 (Anm. 479). L.s ältere elektrische Lampe hat in diesem
29
Verzeichnis die Nr. 312.