| 1. | Most heliographs of the 19th and 20th century were completely manual.
|
| 2. | The first digitally controlled heliograph was designed and built in 2015.
|
| 3. | Communications with the mainland was originally done by a signal lamp or heliograph.
|
| 4. | Ni�pce had experimented further with other chemicals, to improve contrast in his heliographs.
|
| 5. | They requested Dugenne to send a heliograph message back to Hanoi to seek instructions.
|
| 6. | The Mance, Grugam and Pursell heliographs used two tripods, and the others one.
|
| 7. | The heliograph had some great advantages.
|
| 8. | The Canadian Army was the last major army to have the heliograph as an issue item.
|
| 9. | In 1961, the US Air Force was working on a space heliograph to signal between satellites
|
| 10. | The Ni�pce heliograph was not included in the sale, but shortly afterward Gernsheim donated it.
|
मोबाइल