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"found" inverter
You'd really need to check it out Bill - looks like (with it's aluminium case/chassis) a vintage one from 20 plus years back: I think this company is now defunct.
Obviously a 400 watt unit; though whether it was a square wave or sine wave output device you'd have to ascertain - anyone you know with a CRO? If you've a friendly TV repair mate he'd sort that question out. Frequency control/stability is another ponderable, fixed 50Hz inverters would've used a crystal oscillator to "lock" this frequency.
As to its suitability for your laptop, many/most actually convert the 240 VAC back to DC to use on their "rails" (read circuitry power feeds) so they are ammenable to square wave unfixed frequency inverter outputs. Square wave jobs, however, can throw out a lot of radio interference - but in reality laptops usually have an adaptor that converts everything to 12-15 volts DC. Which is to say that you are far better of dispensing with the inverter (because you are just wasting energy) and run it off of a stable DC source: batteries being one such source!
Regards, Darryl.
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