IS 9607 : 1980 Specification for Tertiary Level

1 Scope

1.1 This standard specifies the requirements of non-automatictype tertiary level capable of attaining standard deviation of � 5 mm in 1 km of double levelling.

2 References

IS 988 : 1959General requirements for optical components

IS 1399 : 1959Glossary of terms used in optical technology

IS 1632 : 1960Specification for bubbles

IS 2352 : 1963Procedure for basic climatic and durability tests foroptical instruments

IS 2754 : 1964General requirements for optical instruments

IS 8248 : 1976Specification for antireflection coating on glass opticalcomponents