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Pendulum Bob: a Lead Sphere Cast with Its Eye at the Top Centre
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18. uMfumfu 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.
Ophakathi
1 day

Imiyalelo

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.

Amathuluzi adingekayo:

Ibhulokhi Lokhuni OluqinileIbhulokhi Lokhuni Oluqinile
Umshini wokuphendula ukhuniUmshini wokuphendula ukhuni
I-Caliper Yedijithali Yamayintshi Ayi-6I-Caliper Yedijithali Yamayintshi Ayi-6
Isaha SensimbiIsaha Sensimbi
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.

Izinto zokwakha zalesi sinyathelo:

Ibhawodi elinesiyingiIbhawodi elinesiyingi1 ucezu

Amathuluzi adingekayo:

Isihlabathi sokubumbaIsihlabathi sokubumba
Ibhokisi lokubumbaIbhokisi lokubumba
Ifosholo LesandlaIfosholo Lesandla
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.

Izinto zokwakha zalesi sinyathelo:

Isigaxa SomthofuIsigaxa Somthofu11 kg

Amathuluzi adingekayo:

Ibhodwe lokuncibilikisa lensimbi ethelweIbhodwe lokuncibilikisa lensimbi ethelwe
Iziko lomkhandi wensimbiIziko lomkhandi wensimbi
Udlawu Lwesitsha SokuncibilikisaUdlawu Lwesitsha Sokuncibilikisa
Isikali Sedijithali SasekhishiniIsikali Sedijithali Sasekhishini
Amagilavu okushiselaAmagilavu okushisela
Ipheshana LesikhumbaIpheshana Lesikhumba
Isivikelo SobusoIsivikelo Sobuso
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.

Amathuluzi adingekayo:

Isaha SensimbiIsaha Sensimbi
Iqoqo LamafayelaIqoqo Lamafayela
Isikali Sedijithali SasekhishiniIsikali Sedijithali Sasekhishini
Amagilavu okushiselaAmagilavu okushisela

Izinto

2

Amathuluzi Adingekayo

15

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

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

ngu-AstroIS

Umkhathi

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Sand Casting

Sand Casting

ngu-ForgeNO

UBUCIKO BEZANDLA

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