[pmmunro]

Andy,

I meant to ask if you had the lid. Like other AVO military equipment these often contain a number of useful items - and often seem to have gone astray. We can speculate on the reasons.

Is it possible that there is any documentation on the CT151 in your archives please?

I don't suppose that any correspondence from the sales department of the time has survived. It would be very interesting to know who exactly this sort of kit was designed for and who drew up the specification. It is clearly for military use as it has "CT" numbers.

The 1958 catalogue page states that it meets "Interservices Specification K.114 as laid down by the Radio Component Standardisation Committee of the U.K. Ministry of Aviation" and that "This instrument meets the requirements of the U.K. Air Registration Board".

I seem to remember some advertising material which had a contemporary British jet airliner in the background.

PMM