Advice needed; Circa 1940s tachometer - Page 2
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    Sep 2011
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    Quote Originally Posted by Darren McCarley View Post
    Some great advice in here. Thank you all. First order of operation is to get the lathe working with the VFD. Ill use that read out until such time as I come up with a hall effect solution and a tach.
    Dunno why i didn't think of it.."Period Correct" might surprise you as to not looking old, but advanced, rather.

    Radio sets, autos and machinery were often differentiated by fancy dials and knobs.

    - My 1938 Sparks-Withington "all band" receiver in a burl maple veneered "waterfall" art-deco cabinet had a Copper(silvered) mirror for a dial with several brilliant transparency colours set into it that lighted-up off an extra section on the "band selector" switch.

    -A 1938 Paclard hearse donated a Stewart-Warner speedo as had a thin metal shroud covering the hub of the needle out to a short exposed lucite tip, white background, daytime driving. At night a light back of the hub shone through a multi-coloured wheel. Transmission of the light under that shroud gave a tip that changed colour from white at low speed, gradual fade to green. cruising speeds of the era, IIRC, white again in a narrow band 5 MPH either side of 50, thence to pink at 55, then bloodier and progressively more brilliant red above, "IIRC" 60 MPH.

    The idea, one supposes, is that peripheral colour vision relieved the driver from having to look away from the road - mostly 2-lane blacktop with oncoming traffic, less-standardized headlamp glare at night, and such. Our safer divided motorways with limited-access points of recent years hardly existed anywhere in the country but a few of the largest cities, pre-WWII. The easier it was to keep speed within a desired range, the safer the operation. Mind, straight-eight, 3-speed manual gearbox, a heavy hearse with powered rollers in the bed to manage coffins wasn't exactly a Packard-Darrin sporty car, deep blue-violet velvet bucket seats as became a mate's TV chairs once on casters quite aside.

    Colour, OTOH, is not a BAD idea for machine-tool spindles, either, having an indicator one need not look-away from tool-tip to be at least generally aware of.

    IOW - you may have more leeway than you expected as to "period correct".

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