File:Antikythera-proposed-3.svg
Summary
Gearing layout proposed by Freeth and Jones for planetary indication on the Antikythera mechanism.
This team propose a simplified system to Wright's but utilise the concept of individual planet indicators on the single main face. They also simulate the sun anomaly so there is a separate pointer for date and sun position.
All of the gearing systems are epicyclic and use b1 as their carrier. The inferior planets utilise 2 gears, one fixed and one attached to the b1 gear, rotating around the fixed gear. The rotating gear has a pin and the attached one has a slot, the slot is attached to the indicator shaft. The superior planets utilise a similar four gear system to the lunar system.
Gear trains are:
- Sun: This train is used to induce anomaly in the rotation of the sun, its ratio is 1. So all gears are the same size. In the example given they have 40 teeth.
- Mars: 37/79 * 69/69 = 0.4684
- Jupiter: 76/83 * 86/86 = 0.9157
- Saturn: 57/59 * 60/60 = 0.9661
<bt>
- Mercury: 104/33 = 3.1515
- Venus: 40/64 = 0.625
The idea of planetary indication on the Antikythera mechanism is relatively hotly debated because no hard evidence has ever been found to prove once and for all if such a display existed and if it did how it was engineered.
This image is just a general arrangement of the gearing layout, in a similar style to the image on commons of the known mechanism. This image omits all of the known mechanism apart from a1 and b1 to show where in relation the proposed gears fit.
If more detailed information about the proposed system and how it would be constructed and used please read Tony Freeth and Alexander Jones article entitled "The Cosmos in the Antikythera Mechanism"
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:48, 2 January 2017 | | 607 × 623 (30 KB) | 127.0.0.1 (talk) | Gearing layout proposed by Freeth and Jones for planetary indication on the Antikythera mechanism.<br><p>This team propose a simplified system to Wright's but utilise the concept of individual planet indicators on the single main face. They also simulate the sun anomaly so there is a separate pointer for date and sun position.<br></p> <p>All of the gearing systems are epicyclic and use b1 as their carrier. The inferior planets utilise 2 gears, one fixed and one attached to the b1 gear, rotating around the fixed gear. The rotating gear has a pin and the attached one has a slot, the slot is attached to the indicator shaft. The superior planets utilise a similar four gear system to the lunar system.<br></p> <p>Gear trains are:<br></p> <ul><li> Sun: This train is used to induce anomaly in the rotation of the sun, its ratio is 1. So all gears are the same size. In the example given they have 40 teeth.</li></ul> <p><br></p> <ul> <li> Mars: 37/79 * 69/69 = 0.4684</li> <li> Jupiter: 76/83 * 86/86 = 0.9157</li> <li> Saturn: 57/59 * 60/60 = 0.9661</li> </ul> <p><bt> </p> <ul> <li> Mercury: 104/33 = 3.1515</li> <li> Venus: 40/64 = 0.625</li> </ul> <p><br></p> <p>The idea of planetary indication on the Antikythera mechanism is relatively hotly debated because no hard evidence has ever been found to prove once and for all if such a display existed and if it did how it was engineered.<br></p> <p>This image is just a general arrangement of the gearing layout, in a similar style to the image on commons of the known mechanism. This image omits all of the known mechanism apart from a1 and b1 to show where in relation the proposed gears fit.<br></p> If more detailed information about the proposed system and how it would be constructed and used please read Tony Freeth and Alexander Jones article entitled "The Cosmos in the Antikythera Mechanism"<br> |
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