G6Tanuki said:
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The big tuning knob with extra reduction gear was introduced because wireless operators wearing gloves couldn't easily / accurately adjust the original small knob.
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I guess that was the idea behind the 'click-stop' knobs on the companion T1154. Three different frequency bands and three sets of tuning knobs which were probably set up on the ground before a mission. Set the required letter from the table for a particular frequency on the small knob then rotate the bigger coloured knob until it clicks into the stop. Same procedure used on the "Oceanspan" transmitter when I was at sea in the 60's.