signal mirror:
USMC Heliograph #479
signal mirror:
USMC Heliograph #479, closeup
signal mirror:
USMC Heliograph 479 - Simplex Setup
signal mirror:
US Signal Service Heliograph Sighting Rod 400dpi
signal mirror:
US SIgnal Service Heliograph Sighting Rod, Queen & Co., Philidelphia
signal mirror:
US Signal Service Heliograph Sighting Rod
signal mirror:
US Signal Service Heliograph Model 1892 Simplex
signal mirror:
US Signal Service Model 1892 "Kilbourne" Heliograph Shutter - Side A
signal mirror:
US Signal Service Model 1892 "Kilbourne" Heliograph Shutter - Side B
signal mirror:
US Signal Service Model 1892 "Kilbourne" Heliograph Shutter
signal mirror:
1892 Kilbourne Heliograph Screen HDR
signal mirror:
US Signal Service Model 1892 "Kilbourne" Heliograph Shutter - Base in Case
signal mirror:
US Signal Service Model 1892 "Kilbourne" Heliograph Shutter
signal mirror:
US Signal Service Model 1892 "Kilbourne" Heliograph Shutter
signal mirror:
1892 Kilbourne Heliograph Shutter Open
signal mirror:
Features of Model 1905 US Signal Service Heliograph
signal mirror:
Friez USMC Field Heliograph Shutter #236 - Five view collage
signal mirror:
Keuffel & Esser USFS Heliograph Mirror
signal mirror:
Keuffel & Esser USFS Heliograph Mirror Box
signal mirror:
Keuffel & Esser USFS Heliograph Mirror Box
signal mirror:
Keuffel & Esser USFS Heliograph Case
signal mirror:
Keuffel & Esser USFS Heliograph Mirror Bar
signal mirror:
Keuffel & Esser USFS Heliograph Shutter Views
signal mirror:
Keuffel & Esser USFS Heliograph Case
signal mirror:
Kueffel & Esser USFS Heliograph Mirror Bar Case
signal mirror:
Keuffel & Esser USFS Heliograph Shutter on Tripod
signal mirror:
Keuffel & Esser USFS Heliograph Cases
signal mirror:
Keuffel & Esser USFS Heliograph Duplex Mirrors
signal mirror:
Keuffel & Esser USFS Heliograph Simplex Setup
signal mirror:
Keuffel & Esser USFS Heliograph
