Scope soldering iron

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Scope Laboratories and Omicron Pty in 1962. The location is Matthews Avenue, Airport West. Walton St did not yet exist.

The "Scope" soldering iron is a tool for soldering with lead-tin alloys, made in Australia since 1950, and intended for occasional or intermittent use. It has the virtue of quickly coming up to soldering temperature (~300C) and delivering considerable heat to a small area, but requires care to avoid overheating. It operates on low voltage (3–6 V) and high current (tens of amps) from a battery or suitable transformer, so is by design electrically safe, and as it cools down rapidly when it leaves the operator's hand, should not constitute a fire risk.

"Scope" soldering iron

The soldering iron's "element" is a small carbon tip at the end of a pushrod connected to one terminal of the power supply, inside the stainless-steel barrel of the tool, but insulated from it. The barrel and its copper tip (the "bit"), is connected to the other terminal. When the user operates the pushrod, the carbon element bears against the back of the "bit", resulting in electric heating of the resistive carbon. The user modulates the temperature of the "bit" by the pressure they exert on the pushrod, through a lever or sliding ring, depending on the model.

The carbon element and copper "bit" are replaceable.

History

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