ACCESSORIES

SOUNDING REELS

Sounding reels are used with Gurley current meters to measure depth and lower the instrument from a crane or boat. All reels can be used with either headhones or Model 1100 Digital Indicator. Please specify before ordering.

USGS TYPE A CRANE WITH THREE-WHEEL TRUCK

The Type A crane is a collapsible crane intended for measuring discharge or sediment sampling from bridges. It attaches to either the type A three-wheel truck or the Type A four-wheel truck. The crane is made from aluminum stock with an aluminum outer sheave with ball bearings and a bronze inner sheave. The crane includes a reel mount drilled to accommodate the A-55, B-56 and E-53 sounding reels. It is easily put up and folded down into and easily carried size with no nuts and bolts to put in or remove. The USGS 12-volt electrical power drive unit attaches to this crane with no adaptation necessary.

A liquid-filled (colored antifreeze) protractor, to obtain the vertical angle of the sounding line, also is available as an accessory. The protractor measures vertical angles from –25 degrees to +90 degrees. A USGS stream velocity correction chart also is included with the protractor. Approximate weight of the crane is 45 pounds (20 kilograms).

The Type A three-wheel truck, when attached to a Type A crane, is a popular bridge measuring outfit which is used for weights up to 100 pounds (46 kilograms). The Type A three-wheel truck consists of a two-wheel base assembly, a third (roadside) wheel, and all necessary chassis components. The two-wheel subassembly can be removed with two 3/8 inch (1.0-centimeter) wing nuts to compactly store the collapsible crane.

This unit is easier to set up, operates in a narrower space, and is more maneuverable than the four-wheel truck, also available for the Type A crane. When in use, the crane is tipped up and stands on the two inside wheels while the crane rests on the bridge railing so the boom is extended out over the river. It is, however, less stable with heavier weights, and the boom on the crane does not extend as far as it does on the four-wheel truck. The approximate weight of the truck is 25 pounds (11 kilograms).

The Type A crane is a collapsible crane intended for measuring discharge or sediment sampling from bridges. It attaches to either the Type A three-wheel truck or the Type A four-wheel truck. The crane is made from aluminum stock with an aluminum outer sheave with ball bearings and a bronze inner sheave. The crane includes a reel mount drilled to accommodate the A-55, B-56 and E-53 sounding reels. It is easily put up and folded down into and easily-carried size with no nuts and bolts to put in or remove. The USGS 12-volt electrical power drive unit attaches to this crane with no adaptation necessary.

A liquid filled (colored antifreeze) protractor, to obtain the vertical angle of the sounding line, also is available as an accessory. The protractor measures vertical angles from –25 degrees to +90 degrees. A USGS stream velocity correction chart also is included with the protractor. Approximate weight of the crane is 45 pounds (20 kilograms).

The Type A four-wheel truck attaches to a Type A crane. The rear assembly is adjustable in a vertical direction so that the platform surface will remain parallel with the road surface when operated on curbs or sidewalks. One front and one rear wheel swivels for steering. The handle is collapsible, folding up underneath the truck for ease of transportation and storage.

Up to four 60-pound (27 kilogram) counterweights may be used as ballast when using heavy sounding weights or samplers. The 150-pound (68-kilogram) sounding weight is the maximum to be used with this assembly.

The Type A four-wheel truck is made from aluminum stock with galvanized steel shafts and solid hard-rubber tires. The width is 31 inches (91.4 centimeters). The truck weights approximately 85 pounds (39 kilograms).