Today I added a Belfort Instrument 800A microbarograph to the website.  A recent acquisition, it works very well.  It was made for the US Government and has the military designation ML-563A/UM on one of the plaques.  A very sensitive instrument, a fairly modern design.  It may be found under 'Weather Instrument Collection', under 'Microbarographs'.

​See Belfort Instrument 800A Microbarograph.