The A-55 Sounding Reel is used to position stream gauging and sample collection equipment from an overhead structure or boat. The reel is used with weights up to 45 kg (100 pounds) and holds 23 meters of 0.25 cm diameter Ellsworth sounding cable. The reel can be mounted on Type A and Type E cranes, the bridgeboard, the sit-down or stand-up cable car, and a boat boom assembly. The A-55 reel is equipped with a USGS-type computing depth indicator and can be furnished to read in either Metric or English units. The computing depth indicator has a main dial graduated in meters or feet, and decimeters or tenths of a foot. The numbered inner dial shows total depth and the main dial has a graduated spiral to indicate directly the 0.8 depth position. The Canadian model comes with a 4-digit counter that displays the depth digitally in centimeters. Each reel is equipped with removable handle, steel carrying case and pressed sleeve connector (the Type B connector can be specified if required).
The A-Pack Reel is small and compact and was designed for use at remote sites where it is necessary for the hydrologist to backpack or hand carry the stream gauging equipment for some distance. It is for use with weights up to 23 kg (50 pounds). The drum has 13.7m of 0.25 cm Ellsworth sounding cable. The reel is equipped with a removable handle, steel carrying case and is equipped with a counter to measure water depth in Metric or English units.
The Type A Sounding Reel has the same design specifications as the A-55 but uses the same counter as the A-Pack reel. This allows for a higher capacity reel than the A-Pack with a simpler, lower cost counter than the A-55 reel. The Type A reel counter can be specified to read in either Metric or English units.