![](1. thumb 1st Ranging Section RE Calais 19 April 1915.jpg) |
1. 1st Ranging Section RE Calais 19 April 1915 |
![](2. thumb 11 Nov 1918 Sound Trace 2.jpg) |
2. 11 Nov 1918 Sound Trace 2 |
![](3. thumb Firing Over Open Sights.jpg) |
3. Firing Over Open Sights |
![](4. thumb Flash Spotter - Innes.jpg) |
4. Flash Spotter - Innes |
![](5. thumb Flash Spotter Cartoon - Innes.jpg) |
5. Flash Spotter Cartoon - Innes |
![](6. thumb Flash Spotters & Sound Rangers Conference Bapaume 1917.jpg) |
6. Flash Spotters & Sound Rangers Conference Bapaume 1917 |
![](7. thumb Nov 11 1918 Sound Trace.jpg) |
7. Nov 11 1918 Sound Trace |
![](8. thumb Salmon-Hemming and Monet.jpg) |
8. Salmon,Hemming and Monet |
![](9. thumb Sound Ranging Equipment - Nolan.jpg) |
9. Sound Ranging Equipment - Nolan |
![](10. thumb Sound Ranging Graphs 1.jpg) |
10. Sound Ranging Graphs 1 |
![](11. thumb Sound Ranging Graphs 2.jpg) |
11. Sound Ranging Graphs 2 |
![](12. thumb South OP - Innes.jpg) |
12. South OP - Innes |
![](13. thumb Survey Post diagram - Innes.jpg) |
13. Survey Post diagram - Innes |
![](14. thumb Tina OP - Innes.jpg) |
14. Tina OP - Innes |
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