Spot on LB.
BoM = Bureau of Meteorology. Flying back from a conference in 2002 where the BoM had announced a significant amount of funding to other authorities, we were warned not to mention the "BoM money" at the airport or on the plane.
Dines pluvi = Dines brand pluviograph. When rain falls it goes into the catch and a small tank that has a float in it. As the tank fills, the float rises, driving a pen that writes a trace on a clock-driven chart. When the tank is almost full at a particular depth of rain, it tips and the contents syphon out. The tank then tips back, ready to fill up again. As LB said, they allow you to extract the rainfall rate (intensity) as well as the total amount.
I doubt that there would be many in use now. most rain gauges now are 'tipping bucket' type. Every 0.2 or 0.5 mm of rain, a little bucket shaped like two half-leaves tips and sends an impulse to a data logger. The water tipped from the buckets goes to a storage tank so the depth of rain can be checked.