Cambridge Instruments Thermal pattern L meter Housed in polished bakelite case. Scaled 0-50 milliamps at 111.5 ohms. Thermal junction is open circuit. Cambridge Instrument Company Ltd, UK, date unknown.
This is one of many instruments collected by Jack Davidson C Eng FIEE which I have been given by Dr Graham Winbolt
The meter movement as measured without the faulty junction in place is 0-285 microamps as I have marked on the glass.