I thought these were all removed from the PD-4501s when they were refurbished in 1960-61. I guess not. Here's what one looks like, both close-up and with the driver's seat:
Sunday, October 16, 2011
Wig-Wag
One surprising discovery while working about #739 last Saturday was hanging right in front of me as I sat in the driver's seat. It was a deployed wig-wag signal arm! After #100 was built, GMC added an indicator held 'up' by air pressure when all the baggage and parcel doors were closed. If one were left opened, which triggered the solenoid valve from an 'on' compartment door light switch, the pressure was exhausted and the wig-wag dropped in front of the driver's eyes, telling him to go close the door. When he'd return, he'd then push the wig-way arm up to the left and the restored air pressure would hold it in place.
I thought these were all removed from the PD-4501s when they were refurbished in 1960-61. I guess not. Here's what one looks like, both close-up and with the driver's seat:
I thought these were all removed from the PD-4501s when they were refurbished in 1960-61. I guess not. Here's what one looks like, both close-up and with the driver's seat:
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