Friez ML-77 Thermograph
This 1943 Friez ML-77 bourdon tube thermograph has the original 7 day Friez clock drive and works well. Actually it has the government contract brass tag but not an ML-77 tag on it. It uses a Belfort 1072A chart which has a range of -20 F to 110 F.
The original 1944 War Department manual for the ML-77 may be downloaded here (34 pages):
