device was developed by U.S. Bureau of Public Roads and is used timesaver deflections
of flexible pavements. The light weight instrument is supplied in two parts for
assembling on site with easy hand tools. In use one end of the beam rests at a
point under investigation while the beam is pivoted at the centre. The free end
carries a dial gauge to record the deflections. The other end is kept on a stable
platform. The beam ratio is 2:1 which magnifies even small deflections. Supplied
with a dial gauge 0.01 x 25mm this is a light weight dismount liable instrument
and easy to carry.