tgk

[jan1956]

41d is the soapy froth lather? in which case 49a cannot be Diopsimeter.

thanks jan

[jan1956]

just realised its Pyranometer

[edgar stocks]

gkdt 49a pyranometer

[jan1956]

thanks edgar but as you can see I had already worked it out, classic case of struggling for ages then posting on here and working the answer out for myself in seconds. thanks again jan