Georg Christoph Lichtenberg

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Band 5 - XIII. Von der Erde insbesondere - Texte

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210877
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1 Observations should be constantly taken at noon. The same Vari-
2 ation will not be found at other hours of the Day (: this is no reason
3 for making the observations only at noon. Mr D. supposes that the
4 variation needle is placed in an observatory, and that that observ-
5 atory is only, like his, visited about Noon.
6 As the magnetic Line does not run truely through the points of a
7 magnetical needle, on both the surfaces of the needle: the surfaces
8 must be inverted and the pointing of each surface noticed (: One half
9 of this proposition is false and the other badly expressed. the mag-
10 netic line may run through the axis of the needle, and there is no
11 doubt but needles might be made, whose axis would coincide with
12 the magnetic line. Further to say that the magnetic line does not run
13 through the same points on both surfaces of the needle is downright
14 Nonsense. What is the same point on both surfaces? does he call the
15 same point the two points | 10v = 2opposite one another, or corresponding
16 one another in both the surfaces of the needle, considering the
17 needle as a prism, as he really seems to do, he is the wrong, the
18 magnetic line does run through the same points on both the sur-
19 faces. He meant to say, that the magnetic line does commonly make
20 an angle with the axis of the needle which is found by turning the
21 needle, and putting the upper side under most, just as the line of
22 collimation in quadrant is rectified by observing the same star near
23 the Zenith once with the Limb to the East and another time with the
24 same to the West.
25 When the Variations of both surfaces are taken, add their sums to-
26 gether and the half of such an addition gives the mean Variation. (It is
27 not the mean variation but the true one, which is the mean between
28 the two Variations shewn by the Index (the point of the needle).
29 Thus when the compasses were made for the Royal Observatory at
30 Richmond
31 I found on the 17 of December 1770 that one side
32 of the needle gave20°36West
33 the other2152–Bild im Text at Noon
34 Sum4228
35 mean Variation2114West

Textkritischer Kommentar

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Textkritischer Kommentar (Randtext)

Anmerkungen

Anmerkungen

Herausgeberkorrekturen am Drucktext

Marginalien zur sechsten Auflage

Anmerkungen von Lichtenberg

Registereinträge

0 210876 Verzeichnis der edierten Handschriften ~ NL VIII G 3 ~ Bl. 10. 30935 5 425 15 10v siehe Gesamtregister.
0 210876 Sachregister ~ London ~ Richmond. 23350 5 425 29-30 lichtenberg Royal Observatory at Richmond siehe Gesamtregister.
0 210876 Sachregister ~ London ~ magnetische Deklination / Inklination. 27832 5 425 35 lichtenberg 1 mean Variation 21 14 West siehe Gesamtregister.
0 210876 Sachregister ~ Datierung ~ 1770 Dezember 17. 27831 5 425 31 lichtenberg 17 of December 1770 siehe Gesamtregister.
0 210876 Personenregister ~ Demainbray, Stephen. 23821 5 425 3 lichtenberg D. siehe Gesamtregister.
21087452e161b7abdf9884309714
1472491991837

Abbildungen

Digitalisate

< 0210876542501handschriftVNat_5VIII_G3_011r-025.jpg11r VIII G 3, 11r >
021087654251501handschriftVNat_5VIII_G3_010v-024.jpg10v = 2 VIII G 3, 10v = 2
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