Re: Hatfield Instruments, Ltd.: history?
On the back of the psophometer manual their address was Burrington Way, Plymouth, PL5 3LZ DEVON GB. That fits with Mike T's Google View info.
An associated company was Hatfield Instruments (NZ) Ltd. PO BOX 561 Napier, New Zealand. There were about 30 overseas agents.
A picture on the front cover of their factory, probably 1950's to 60's,
Rich
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