| 1. | The Mangin apparatus with heliostat was still in service in 1917.
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| 2. | A tower resides in the center of the heliostat field.
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| 3. | Many other types of heliostat have also occasionally been used.
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| 4. | So instead of a continuous motion, the heliostat is moved in discrete steps.
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| 5. | A conventional design for the heliostat's reflective components utilizes a second surface mirror.
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| 6. | There are heliostat designs which do not require the rotation axes to have any exact orientation.
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| 7. | In addition, Greenway heliostat design allows high reflecting efficiency and reduced manufacturing and assembly costs.
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| 8. | In correspondence with Isaac Newton, Cotes designed a heliostat telescope with a mirror revolving by clockwork.
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| 9. | The designer described the Solar Beacon as a " heliostat ", not a " heliograph ".
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| 10. | The target may be a physical object, distant from the heliostat, or a direction in space.
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