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