Tripura
Tamil Nadu
Kerala
Karnataka
Germany
Ireland
South Africa
England
being economical
having simple operating mechanism
consuming less bial voltage
better high frequency response
survey work can be completed more quickly
plotting can be made quickly
the errors or mistakes of one portion does not affect other portions
error will be minimum
better insulation should be put over pipe and inferior one over it
inferior insulation should be lput over pipe and better one over it
both may be put in any other
whether to put inferior insulation or better insulation over pipe depends on steam temperature