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Pendulum Bob: a Lead Sphere Cast with Its Eye at the Top Centre
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Forge

Imeundwa na

Forge

18. Oktoba 2026NO
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Pendulum Bob: a Lead Sphere Cast with Its Eye at the Top Centre

A long pendulum needs a heavy, symmetrical bob: Foucault's of 1851 was a 28 kg brass-coated lead bob on a 67 m wire. This one is a solid lead sphere 12 cm across, about 10 kg, cast in sand with an eye bolt set in its exact top centre so the wire hangs through its axis. Size and method are ours. The picture: our drawing.
Kati
1 day

Maagizo

1

Turn the pattern

Turn a hardwood ball 12 cm across on the lathe, checking it with the caliper in several directions, and saw it in half through its centre for a split pattern.

Zana zinazohitajika:

Kipande cha mbao ngumuKipande cha mbao ngumu
Kerezo cha mbaoKerezo cha mbao
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Msumeno wa chumaMsumeno wa chuma
2

Ram the mould

Ram one half in each part of the flask, draw them, and cut a sprue into the cavity to one side of the top. Set the eye bolt upside down in the sand of the top so its threaded shank hangs into the cavity exactly on the sphere's axis.

Vifaa kwa hatua hii:

Bolti yenye jichoBolti yenye jicho1 kipande

Zana zinazohitajika:

Mchanga wa kusubuMchanga wa kusubu
Sanduku la kuundiaSanduku la kuundia
Mwiko mdogo wa bustaniMwiko mdogo wa bustani
3

Melt and pour

Melt about 11 kg of lead in an iron pot on the forge. Skim it and pour into the sprue in one go until the sprue stands full. Let it cool in the sand.

Vifaa kwa hatua hii:

Mche wa RisasiMche wa Risasi11 kg

Zana zinazohitajika:

Chungu cha kuyeyushia cha chuma cha kutupwaChungu cha kuyeyushia cha chuma cha kutupwa
Fua ya mhunziFua ya mhunzi
Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
Glavu za kulehemuGlavu za kulehemu
Aproni ya NgoziAproni ya Ngozi
Ngao ya UsoNgao ya Uso
4

Trim and check

Shake it out, saw off the sprue and file the seam. Hang it by the eye: it must hang still with the eye straight above the centre. Weigh it.

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Seti ya tupaSeti ya tupa
Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
Glavu za kulehemuGlavu za kulehemu

Vifaa

2

Zana Zinazohitajika

15

Mchoro huu unatengeneza

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Kishikilia nafasi

Uzito wa pendulamu

Free

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Building a Foucault Pendulum — Proving Earth Rotates with a Swinging Weight

Building a Foucault Pendulum — Proving Earth Rotates with a Swinging Weight

na AstroIS

Nafasi

108
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0
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Sand Casting

Sand Casting

na ForgeNO

UJANJA

47
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0
0
0
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