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Heliograph, usable as a heliotrope over short distances, with stand and components

Heliograph, usable as a heliotrope over short distances, with stand and components

1900-1911
Heliograph, usable as heliotrope, 1900-1911

Heliograph, usable as heliotrope, 1900-1911

1900-1911
Sight vane for heliograph

Sight vane for heliograph

1900-1911
Heliograph by Cary, c.1830

Heliograph by Cary, c.1830

1830
Framed heliograph of Dr. Rudolph Diesel

Framed heliograph of Dr. Rudolph Diesel

3 Heliograph mirrors

Three mirrors for heliograph

1900-1911