is approximately 3,800 pounds, and its over-all dimensions are 55 

 inches by 52 inches by 58 inches. A series-600 electrical cable reel 

 was installed aboard the USS SAN PABLO in February I960. 



E. HOISTS 



This category is comprised of light-duty reeling machinery, spec- 

 ifically the BT hoists, which are aboard all survey vessels of the U. S. 

 Navy and other agencies and utilized for many purposes. The BT 

 hoist is a line-produced item and comes in many models differing 

 primarily in power requirements. All models have essentially similar 

 operating characteristics, that is, a capacity of 2,000 feet of 3/32 inch 

 wire rope, free wheeling during lowering, and a hoisting speed of 

 approximately 300 feet per minute at lower ship speeds. Until 1953, 

 all models were of the E-2 side-drum construction, but to date practic- 

 ally all of these have been replaced with the E-6 center-drum model. 

 In addition, with the added importance of thermostructure data to 

 antisubmarine warfare that necessitates BT measurements to 900 feet 

 as against 450 feet as previously established, the Bureau of Ships 

 recently has contracted for an improved model with greater wire 

 capacity (3,000 feet) and better operating characteristics. 



A new model hoist, the series-200 hoist, also was constructed 

 for the Hydrographic Office by the Commercial Engineering Corp- 

 oration. This hoist, a smaller version of the series-600 reel, is engi- 

 neered as a component of the electronic BT system and is built to 

 handle 3,000 feet of .190 electrical cable. It also has a single lever 

 control, six slip- rings, interchangeability of drums, andan eddy current 

 coupling which slips as the brake is applied, thus enabling use of any 

 speed within the speed range. This hoist is a °packaged n model that 

 has an attached A-frame reaching outboard nine feet from the hoist. 

 The gross weight of this unit is approximately 1,140 pounds, and its 

 dimensions are 25 inches by 24 inches by 38 inches over-all. One unit 

 of this series also has been installed aboard the USS SAN PABLO and 

 has given excellent results to date. In addition, one of the series-200 

 hoists has been installed aboard a USCG weather ship and is being 

 used to collect data for the Hydrographic Office. 



F. CONCLUSIONS AND RECOMMENDATIONS 



Emphasis on synoptic oceanography will increase the requirements 

 for portable oceanographic winches. Simplicity of installation is an 

 important design criterion since these winches must be shifted from 

 vessel to vessel. 



XVI- 4 



