ED
+
The Kew heliograph being used during the British astronomical expedition to view the total solar eclipse Spain 1860 The temporary observation point
ED
+
The Kew heliograph being used during the British astronomical expedition to view the total solar eclipse Spain 1860 The temporary observation point
ED
+
Heliograph a visual telegraph for sending and receiving messages by means of mirrors and sunlight Here a British signal unit in tropical kit are sen
ED
+
British soldier signalling with a heliograph on the Indian frontier Dated 19th Century
ED
+
Illustration depicting Begbies heliograph Dated 19th Century
ED
+
Illustration depicting Mances field heliograph Dated 19th Century
ED
+
British soldier signalling with a heliograph Heliographs were used a great deal during the Zulu; Afghan and South African campaigns Dated 19th Centu
RM
+
Total solar eclipse 1893 Photoheliograph image of the total solar eclipse viewed by German-American astronomer John Martin Schaeberle (1853-1924) fr
RM
+
Spectra of the Sun and stars
RM
+
The Wilna Photo-heliograph
ED
+
British soldier signalling with a heliograph Heliographs were used a great deal during the Zulu War Dated 19th Century
ED
+
British marines practicing sending and receiving signals by heliograph
ED
+
Heliograph a visual telegraph for sending and receiving messages by means of mirrors and sunlight Here a British signal unit in tropical kit are sen
ED
+
Drawing by the French painter Ingres Reproduction of a heliograph by Sanchez Gerona
ED
+
Heliograph a visual telegraph for sending and receiving messages by means of mirrors and sunlight Here a British signal unit in tropical kit are sen
ED
+
The Kew heliograph being used during the British astronomical expedition to view the total solar eclipse Spain 1860 The temporary observation point
RM
+
Photoheliograph for 1874 transit of Venus
RM
+
Photoheliograph for 1874 transit of Venus This is a telescope that is used to photograph the Sun It was one of five photoheliographs built for the B
18
0
https://www.afloimages.com/search/heliograph.html