Log in or Sign up
Antiques Board
Home
Forums
>
Antique Forums
>
Antique Discussion
>
Korean Ruler Brass and Birch(?) 10' Folding Ruler or Measure?
>
Reply to Thread
Message:
<p>[QUOTE="khl889, post: 246922, member: 104"]Japanese.</p><p><br /></p><p>The first line tells us this was associated with the Type 15 Gun Camera, which was used mainly for training.</p><p><br /></p><p>The second line I roughly parse as "Shooting -- Success -- Examine -- Slide Projector Use -- Distance Measure Ruler (Metre)."</p><p><br /></p><p>I don't know much about how the Japanese trained aerial gunners, but I assume the films taken by the camera in training were later projected on a screen, and this ruler was used to determine how far off target the aim was.</p><p><br /></p><p>Add:</p><p><br /></p><p>I now see that on the overall photo there's an additional mark on the ruler to the far right that marks the optical center. Again, I don't know much about projectors, but I'd assume this mark was used to set up the screen at the proper distance from the projector. This might explain why the ruler is marked on two sides: one for setting up the screen at the right distance, the other for measuring aiming accuracy on the images. Presumably you'd need to set the screen at the correct distance from the projector to get consistent readings when measuring aiming accuracy.[/QUOTE]</p><p><br /></p>
[QUOTE="khl889, post: 246922, member: 104"]Japanese. The first line tells us this was associated with the Type 15 Gun Camera, which was used mainly for training. The second line I roughly parse as "Shooting -- Success -- Examine -- Slide Projector Use -- Distance Measure Ruler (Metre)." I don't know much about how the Japanese trained aerial gunners, but I assume the films taken by the camera in training were later projected on a screen, and this ruler was used to determine how far off target the aim was. Add: I now see that on the overall photo there's an additional mark on the ruler to the far right that marks the optical center. Again, I don't know much about projectors, but I'd assume this mark was used to set up the screen at the proper distance from the projector. This might explain why the ruler is marked on two sides: one for setting up the screen at the right distance, the other for measuring aiming accuracy on the images. Presumably you'd need to set the screen at the correct distance from the projector to get consistent readings when measuring aiming accuracy.[/QUOTE]
Your name or email address:
Do you already have an account?
No, create an account now.
Yes, my password is:
Forgot your password?
Stay logged in
Antiques Board
Home
Forums
>
Antique Forums
>
Antique Discussion
>
Korean Ruler Brass and Birch(?) 10' Folding Ruler or Measure?
>
Home
Home
Quick Links
Search Forums
Recent Activity
Recent Posts
Forums
Forums
Quick Links
Search Forums
Recent Posts
Gallery
Gallery
Quick Links
Search Media
New Media
Members
Members
Quick Links
Notable Members
Registered Members
Current Visitors
Recent Activity
New Profile Posts
Menu
Search
Search titles only
Posted by Member:
Separate names with a comma.
Newer Than:
Search this thread only
Search this forum only
Display results as threads
Useful Searches
Recent Posts
More...