ID this Trailer Chaps

[alamotex]

Originally Posted by Local Chap

It's only half of the GL MkIII set. It's the APF (Altitude position Fix) trailer. There was also a ZPI (Zone Position Indicator) to complete the set.

Just how I missed this thread when it was active in May 2011, beats me...the GL III(c) story is a major interest of mine and Local Chap's post is a good place for me to add my two cents worth. The on-line source for the three attached thumbnails was yours truly..in fact the two coloured images APF ( Accurate Position Finder ) and the ZPI ( Zone Position Indicator ) were taken in Shilo, Manitoba when it was first discovered ( 2006 ) that one GL III (c) had survived in Canada. The Canadian developed GL III (c) was the first centimetric mobile gunlaying radar to be put into mass production by the Allies during WW II. It represents a remarkable achievement by Canadian Scientists and Engineers when microwave technology was in its infancy. What is remarkable about the APF unit at Shilo is that much of the original (1942 )interior pre solid state electronics is still in place ( see attached ) and could be partially restored if certain obstacles could be overcome. I was aware of the two gutted ZPI trailers discovered in Oz by Tony Smith, but those referred to in this thread are new to me. Please get in touch by PM if you wish to dialogue further on this topic.

Cheers Brian