Signal safari part 3

[NW Mailing List]

As built, the position light signals had center bulbs in the targets and all the bulbs were amber in color. If any one bulb was burned out, you could still read the position with the remaining two. When they were converted to "color" position lights, the center bulbs had to go, as they couldn't change color when the indication changed. So they still mimicked a semaphore, but with only two lights in a row instead of three. If any one bulb was burned out, you could still see the color of the other one. But the lower target on 408 is something else, as a normal target would not have had a center bulb.
 
Jim Nichols
 

________________________________
 From: NW Mailing List <nw-mailing-list at nwhs.org>
To: NW Mailing List <nw-mailing-list at nwhs.org> 
Sent: Monday, August 5, 2013 4:32 PM
Subject: Re: Signal safari part 3
  


Okay, so can someone explain the differences between 408 & 410?  While the upper targets are the same, the lower ones are not.

Is there significance in that the lower target on 408 has only the
      center spot lighted?  My very rudimentary understanding of all
      position lights is that their design was meant to 'mimic' a
      semaphore, so my expectation here would be that all three lights
      should be on (and that the illumination of any one of them is the
      same as if all three were lighted.)

Ed Bell

On 8/5/2013 8:51 AM, NW Mailing List wrote:
 
A couple old soldiers at Iaeger, and a shot from Keystone. 

>Jim Cochran

>

>Moderator:  

>http://nwhs.org/wiki/tiki-browse_image.php?imageId=408 http://nwhs.org/wiki/tiki-browse_image.php?imageId=409

>http://nwhs.org/wiki/tiki-browse_image.php?imageId=410

>  

> 

 
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