Due to shrinkage factor. When paper/plan will shrink, the drawn scale accordingly shrink and you can calculate the shrinkage factor. Accordingly you can apply the shrinkage correction to the measured plan length.
Suppose,
grid value was 10cm at the time of preparation of plan
After 10 yeras, grid value= 9.7cm
Shrinkage factor=10-9.7 = -3mm/100=0.003(-), hence correction=Positive.
This occurs generally with tracing paper/cloth.
To avoid shrinkage, use Polyster film of 25 micro mm (as Adviced by DGMS)
Nihar Mitra
Tata Steel
Sukinda-FAMD
--------------------------------------------
On Mon, 17/2/14, Saroj kumar Mirdha <saroj.1107@yahoo.com> wrote:
Subject: DGMS Mailing List: (unknown)
To: dgms_mail_list@yahoogroups.com
Date: Monday, 17 February, 2014, 7:52 PM
why do u show scales of the
plan,at least 25cm long and suitably sub
divided? can any one tell the
exact answer please.
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (7) |
Directorate General of Mines Safety, Ministry of Labour & Employment, Govt. of India
Websites: http://www.dgms.net and http://www.dgmsindia.in and http://www.dgms.gov.in
--------------------------------------------------------------------------------------------------------
If for any reason you wish to unsubscribe from DGMS Mailing List, send an email to:
dgms_mail_list-unsubscribe@yahoogroups.com
0 comments:
Post a Comment