Horology. Functional and non-functional jewels Ingestion-build-232773 BS 4371 guidelines provide you

BS 4371 guidelines provide you with specifications for manufacturing fibrous gland packings of different materials

NOTE: This standard is applicable to finger protection devices fitted to side hung and pivoted doors with single or double swing

Requirements as to gas insulated switchgear have been added

• Types of inspection

flow gauges

Horology. Functional and non-functional jewels Ingestion-build-232773 BS 4371 guidelines provide you1 Scope This International Standard specifies the technical definitions of functional and non functional horological movement jewels. It describes the different types of jewels used, and how this is to be marked on a timekeeping instrument or used in advertising.