cameras, 16-mm movie cameras capable of film speeds from 8 to 3,000 

 frames per second, oscillograph and oscilloscope recording cameras, 

 and an Omega D-2 enlarger, 



(c) A sedimentological laboratory equipped to analyze 

 the size, shape, roundness, surface texture, mineral content, calcium 

 carbonate content, specific gravity, porosity and permeability of 

 sedimentary materials. The laboratory equipment includes: a fixed 

 and a portable motor driven Ro-tap testing sieve shaker, a set of 

 sieves ranging in size from 1 inch to 0.035 millimeter, a Jones sample 

 splitter, a microsplitter , a Brookfield spindle-type viscosimeter , two 

 visual accumulation tube sand size analyzers, a portable electric oven 

 with a variable range of temperatures to 430°F , equipment to make 

 heavy mineral separations Eind microscope mounts, polarizing monocular 

 microscope and binocular microscope, balance. La Chatelier specific 

 gravity bottles, pipettes, and a permeameter. 



(d) Field equipment sufficient to make complete near- 

 shore hydrographic surveys includes: two amphibious vehicles (DUKIV), 

 two sonic sounders (Bludworth N-K-2) which will operate in depths up 

 to 180 feet, radio equipment for ship-to-shore communication, topo- 

 graphic and hydrographic survey instruments and equipment, ocean bottom 

 sediment samplers, a mobile field office, salt and fresh water step- 

 resistance wave gages and programmers, and pressure-type wave gages. 

 Recently the Beach Erosion Board completed the development of an 

 in-place sediment density gage designed for obtaining the sediment 

 density in soft bottom materials. The gage is 16 inches long l^ inches 

 in diameter and weighs 15 pounds. After the gage is lovvered into the 

 water and made to penetrate the bottom material, radioactive particles 

 and gamma rays are emitted from a weak radium source in the gage head. 

 The gamma rays which are reflected from the sediment surrounding the 

 probe are picked up by a detector also located in the gage head. The 

 number of ionizing events reaching and being detected by the detector 

 is transmitted to a nuclear counting device at the water surface. The 

 number of counts per unit of time is a measure of the density of the 

 material in a doughnut -shaped area approximately 1 foot thick and 2 

 feet in diameter with the gage source at the approximate center. The 

 gage has been calibrated for use in most common sediments and gives the 

 density in grams per liter. 



(e) Equipment of original design for special require- 

 ments. Since it is necessary to test and calibrate the field and 

 laboratory wave gages (step-resistance type) after repair or develop- 

 ment, two water tanks are available for this operation: one containing 

 fresh water and the other salt water (simulating sea water) . Concrete 

 culvert pipes, 3 feet in diameter and 12 feet in length, placed on end 

 and sealed at the bottom, give sufficient depth for testing and 

 calibrating any existing gages. Calibrating equipment is also available 

 for testing and calibrating ordinary pressure type wave gages by the 



29 



