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Hmm,

 

I was cleaning my work table and placing items in their proper areas.

I have four metallic rulers, both showing the metric and imperial units.

By pure curiosity I placed the shortest one,  15.24cm  - 6" next to my 30.48cm  - 12" and my two 45.72cm  -18" and found differences.

None measured as the other.

The difference is so slight, but could probably cause error when mixed.

Now I marked the 15.24cm and 45.72cm that are almost identical.

The other two to be donated to friends 3rd grader school kids.

 

A high quality digital caliper needs to be purchased. 

 

Please, visit our Facebook page!

 

Respectfully

 

Per aka Dr. Per@Therapy for Shipaholics 
593661798_Keepitreal-small.jpg.f8a2526a43b30479d4c1ffcf8b37175a.jpg

Finished: T37, BB Marie Jeanne - located on a shelf in Sweden, 18th Century Longboat, Winchelsea Capstan

Current: America by Constructo, Solö Ruff, USS Syren by MS, Bluenose by MS

Viking funeral: Harley almost a Harvey

Nautical Research Guild Member - 'Taint a hobby if you gotta hurry

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Good to know.  I also know what I am doing when I get home from work tonight!  I have about 6 different rulers, thanks!

Casey

 

"I drank what?" - Socrates

 

Current Builds:  

                                  

Finished Builds: 

 

Future Builds:        

  • Mamoli Golden Hind
  • Mamoli Black Prince
  • AL Swift
     

 

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Sinan, but first check the caliper is accurate first ;)  Mine were out and I have just invested in a "Certifed" digital readout Caliper.

 

Per, the other trick is to check them for straightness.  I believe the check is done by using one edge to draw a line then flip the ule vertically (same edge but running the other way) and draw another line over that and see if they are coincident - repeat for the other edge.  I use a square or solid base to rest the ruler on but you need to be sure the bases (short edges) of the ruler are square also.  There used to be a good write-up on MSW 1 ... another lost  .... :)

 

cheers

 

Pat

If at first you do not suceed, try, and then try again!
Current build: HMCSS Victoria (Scratch)

Next build: HMAS Vampire (3D printed resin, scratch 1:350)

Built:          Battle Station (Scratch) and HM Bark Endeavour 1768 (kit 1:64)

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there's an old story somewhere about the buyer of a ship slipping into the shipyard one night and replacing the shipbuilders measuring stick with one that was stretched by 10 percent. Of course he ended up getting a ship 10 percent bigger!

Pat M.

Matthews Model Marine

Model FUNCTION as well as FORM.

Get your boats wet!

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