Reply
 
Thread Tools Display Modes
  #1  
Old 05-28-2001, 01:57 PM
Johnny L.A. Johnny L.A. is offline
Charter Member
 
Join Date: Jan 2000
Location: NoWA
Posts: 57,714
On most large ships and many large boats I've noticed a round transparent disc about a foot across in the front bridge window. I seem to remember seeing a vertical radius in them. What is this? I assume it is some sort of navigation device whereby an object's position can be identified as so-many degrees off of the bow. Is that right? What is it called?
__________________
'Never say "no" to adventure. Always say "yes". Otherwise you'll lead a very dull life.' -- Commander Caractacus Pott, R.N. (Retired)

'Do not act incautiously when confronting a little bald wrinkly smiling man.' -- Lu-Tze
  #2  
Old 05-28-2001, 02:11 PM
Rayne Man Rayne Man is offline
Guest
 
Join Date: Jan 2001
Location: Newark-On-Trent UK
Posts: 3,743
Windscreen Wiper

On some ships that disk is a type of windscreen(shield) wiper. What happens is that the disk spins at high speed and throws all the water off. Thus the crew on the bridge always have an clear area to look through even in very heavy rain or spray
  #3  
Old 05-28-2001, 02:31 PM
CnoteChris CnoteChris is offline
Guest
 
Join Date: Apr 2000
Location: Minneapolis, Minnesota.
Posts: 3,230
Here's a picture of one for those who are curious.
  #4  
Old 05-28-2001, 02:31 PM
Johnny L.A. Johnny L.A. is offline
Charter Member
 
Join Date: Jan 2000
Location: NoWA
Posts: 57,714
That makes sense. They have the same sort of thing for movie cameras.
  #5  
Old 05-28-2001, 03:43 PM
ElvisL1ves ElvisL1ves is offline
Charter Member
 
Join Date: Jul 2000
Location: The land of the mouse
Posts: 43,889
The same things are used on the enclosures of some high-speed production milling machines, so the operator can see what's going on through the "rainstorm" of coolant.
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 07:07 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

Send questions for Cecil Adams to: cecil@chicagoreader.com

Send comments about this website to: webmaster@straightdope.com

Terms of Use / Privacy Policy

Advertise on the Straight Dope!
(Your direct line to thousands of the smartest, hippest people on the planet, plus a few total dipsticks.)

Publishers - interested in subscribing to the Straight Dope?
Write to: sdsubscriptions@chicagoreader.com.

Copyright 2017 Sun-Times Media, LLC.

 
Copyright © 2017