Original vintage Instruction Booklet 46B1a for SPC20 & SPC25 Spring Closing Mechanisms, produced by Ferguson, Pailin Ltd., Manchester. A technical manual covering the operation, maintenance, and construction of industrial electrical/mechanical closing mechanisms.

This booklet is a great piece of industrial and engineering history, ideal for collectors, engineers, or those working with vintage switchgear and mechanical systems.

Contents include:

• General overview and construction details
• Operating instructions
• Commissioning procedures
• Maintenance guidance (removal, mounting, spring changes)
• Types of release (lanyard, manual delay, electrical)
• Technical diagrams and labelled component drawings
• Step-by-step operational explanations

Features detailed black & white diagrams and photographs illustrating internal mechanisms and components.

Condition (Used):

• Light to moderate wear to covers with some marks and handling wear
• Punch holes along spine (as issued for filing/binder use)
• Minor creasing and light discolouration consistent with age
• Pages are intact, clean, and fully readable
• No major tears or missing pages noted

Key Details:

• Title: Spring Closing Mechanisms (SPC20 & SPC25)
• Booklet No: 46B1a
• Manufacturer: Ferguson, Pailin Ltd.
• Format: Softcover booklet
• Language: English
• Subject: Industrial / Electrical Engineering / Switchgear

A useful reference manual or collectible piece for those interested in vintage industrial equipment, electrical systems, or engineering documentation.