| Evaluation of the Commercial Model U.S. Divers Co. Two Stage Aqua Lung Regulator (Aqua-Master) for Use on Surface Supplied Diving (Using Hookah), |
06 MAY 1959 |
|
| Authors:
G. W. Hanger; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
 | A commercial model of U. S. Divers Co. new two stage Aqua Lung regulator, the AQUA-MASTER, is evaluated as regards its Hookah attachment for low pressure, surface supplied demand-type diving. Low pressure (75-100 psi at surface) is introduced through a Hookah attachment into the interstage cavity. Mechanical respirator and trapeze ergometer tests, similar to those required by the MILSPEC, are reported. The regulator is recommended as satosfactory for use to ... |
|
| Evaluation of Second Preproduction Sample of U. S. Divers Co. Two Stage Open Circuit 'Aqua-Master' Scuba Regulator. |
30 MAR 1959 |
|
| Authors:
C. W. Hanger; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| A second preproduction sample (NObs 74166) of an open circuit Scuba demand regulator is given a complete evaluation in accordance with applicable military and purchase specifications and the standard Experimental Diving Unit (EDU) evaluation procedure. The equipment evaluated consists of a two stage regulator, the D.A. Aqua-Master. This second preproduction sample is essentially the same as that in EDU Evaluation Report 8-59. In addition to substituting the old style upper ... |
|
| A Comparative Evaluation of the Standard U. S. Navy Shallow Water Divers Mask, and the Scott Aviation Corp. 'Constant Flow Shallow Water Diving Mask'. |
24 MAR 1959 |
|
| Authors:
C. M. Prickett; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| A new commercial shallow water divers mask is evaluated in comparison with the older standard shallow water divers mask. The new mask is considered an acceptable shallow water mask. (Author) |
|
| Limited Evaluation of U.S. Divers Co. Revised Single-Stage Aqua Lung Regulator (Mistral), |
15 DEC 1958 |
|
| Authors:
G. W. Hanger; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| A prototype of a new model, single-stage open circuit Scuba produced by U.S. Divers Company is given a limited mechanical respirator evaluation. The regulator is identified as the 'MISTRAL' with venturi action. The mechanical respirator characteristics are compared with similar data from U.S. Divers Co.'s earlier DX and DW single stage units. The MISTRAL's respiratory characteristics (machine only) are similar to the new two-stage regulator and superior to the older ... |
|
| Evaluation of the Preproduction Sample of U. S. Divers Co. Revised Two Stage Aqua-Lung Regulator ('Aqua-Master') and Improved Scuba Cylinders, |
05 DEC 1958 |
|
| Authors:
G. W. Hanger; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| The equipment evaluated consists of U. S. Divers Co's new two stage regulator, the 'Aqua-Master', and a pair of revised type 3000 psi aluminum cylinders, as specified by BUSHIPS, with straight thread O-ring sealing arrangement. The overall apparatus did not meet acceptance criteria; having an unacceptably high exhalation resistance as a consequence of a new design exhaust flapper valve. Substitution of the old style upper cover-exhaust valve assembly brought the ... |
|
| Evaluation of a Proposed Underwater Swimmer's Life Jacket. |
24 OCT 1958 |
|
| Authors:
H. L. Brooks Jr.; C. J. Leyden; C. M. Prickett; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| The requirements for a Scuba Life Preserver for use at depths to 100 ft. are studied along with the characteristics of the existing UDT Life Preserver and the Submarine Life Preserver. It is concluded that a Scuba Life Preserver having 15 pounds positive buoyancy at 100 ft. and 24 pounds buoyancy at the surface is feasible and specific recommendations are made for the construction of prototype units. (Author) |
|
| Emerson Mixed-Gas Scuba: Further Preliminary Evaluation of the Flow Characteristics of the Prototype Regulator-Orifice Unit; Preliminary Evaluation of Mouthpiece, Check Valves, and Hose Assembly. |
03 OCT 1958 |
|
| Authors:
C. J. Leyden; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| This is the second report covering evaluation of individual components of the standard U.S.N. mixed-gas scuba. A modified gas regulator with drilled orifice is tested and found to meet specifications. The breathing bag adjustable relief valve is tested and found to meet specifications with minor modification. The mouthpiece, check valve and breathing tubes are tested for resistance drop and found to be satisfactory. (Modified author abstract) |
|
| An Evaluation of an Exhaust Muffler for Open Circuit Scuba Developed by the U.S. Navy Mine Defense Laboratory, |
01 OCT 1958 |
|
| Authors:
G. W. Hanger; G. Haslip; P. G. Linaweaver; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| An exhaust muffler of noise suppression device, for installation in the exhaust circuit of an open-circuit scuba, is given extensive mechanical respirator and subjective tank evaluation and limited field test. The device has definite respiratory limitations and its use is consequently recommended to be restricted to light work and to specific depths. (Modified author abstract) |
|
| Evaluation of Circle Clamp Corp. Deep Sea Divers Hose Clamps, |
02 SEP 1958 |
|
| Authors:
C. J. Leyden; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| A simple hose clamp is evaluated as a possible substitute for the bronze, screw-type clamp on the standard diver's air hose coupling. The clamp is found to have adequate holding power but has several minor disadvantages and no real advantages over the standard clamp and, as such, is not recommended for adaptation as standard though its use as a war time substitute item is considered warranted. (Author) |
|
| Walter Kiddie and Co. Non-Magnetic Scuba Cylinder Assembly with Buoyancy Compensator, |
02 SEP 1958 |
|
| Authors:
G. W. Hanger; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| The purpose of the evaluation is to determine the value of the Walter Kiddie, Non-Magnetic Scuba Cylinder Assembly, with Buoyancy Compensator, as a scuba cylinder unit for Navy use. Several new features are presented in this piece of equipment, which have been taken into consideration. An O-ring is used to form a seal where the cylinder plugs screw into the cylinder. The air reserve mechanism is somewhat simplified from the ... |
|
| Linde Mixed-Gas Constant Mass Flow Regulator: Preliminary Evaluation of the Flow Characteristics of the Prototype Regulator. |
25 AUG 1958 |
|
| Authors:
C. J. Leyden; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| A mixed-gas scuba regulator for use as a component part of a standard mixed-gas scuba is evaluated. The unit's flow characteristics (constant-mass-flow with increasing depth), when used in conjunction with changeable orifice plates, were found to be satisfactory in all respects. The practicability of using a single orifice plate and varying regulator pressure to obtain desired flows is demonstrated but the selection of a single, optimum orifice plate is left ... |
|
| Emerson Mixed-Gas Scuba: Preliminary Evaluation of the Flow Characteristics of the Prototype Regulator-Orifice Unit. |
01 AUG 1958 |
|
| Authors:
W. F. Searle Jr; A. L. Zamperini; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| The study evaluates the prototype model of a mixed-gas scuba regulator-orifice unit for use as a component part of a standard U.S.N. mixed-gas scuba. The unit's stability over long time flow and its reproducibility after frequent shut downs was found to be satisfactory; its flow characteristic as a function of bottle pressure, particularly at low pressure, was found to be barely satisfactory with improvement desirable. The flow characteristics (constant-mass-flow with ... |
|
| Comparative Evaluation of Three Commercially Available Swiss-Made Submersible Wrist Watches, |
15 JUL 1958 |
|
| Authors:
C. M. Prickett; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| Three commercially available, Swiss made, submersible wrist watches, Rolex, Blancpain and Enicar, are comparatively evaluated and in turn are compared with the still-under-development standard USN watch (Bulova). Specific features of the Swiss watches (strap and second hand) are recommended for inclusion in the USN watch. The Rolex watch is found to be not sufficiently waterproof, bearing out reports from the field and is recommended for deletion from the Navy's approved ... |
|
| Bulova Wrist Watch, Submersible, (II). |
07 MAY 1958 |
11 pages |
| Authors:
C. M. Prickett; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
 | Three Bulova submersible wrist watches, the second submission for test of preproduction samples, are evaluated for conformance with the watertightness specifications of MIL-SHIPS-W-2181. Other specification tests were satisfactory as reported in Evaluation Report 5-58. Of three watches tested, one failed and indication was recorded on the color indicator. The watch which failed, however, continued to run and did not show evidence of moisture, fog, or droplets on the underside of ... |
|
| The Design of an Adjustable Breathing Bag Exhaust Valve for Closed and Semi-Closed Circuit Scuba. |
05 MAR 1958 |
|
| Authors:
W. F. Fischer; C. J. Leyden; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| Existing closed and semi-closed circuit scuba breathing bag exhaust or relief valves were studied with the object of developing a standard U.S. Navy valve. A Canadian relief valve proposed as a substitute for the British CDBA relief valve was also studied. The latter valve (CDBA) was used as a starting point, and redesigned to provide a range of relief adjustment from approximately 0.4 to 2.85 psi. A relatively secure, manually ... |
|
| An Evaluation of the Rand Flow Indicator as a Warning Device in the Constant-Mass-Flow Supply Circuit of a Semi-Closed Circuit Scuba. |
04 FEB 1958 |
|
| Authors:
W. G. Fischer; C. J. Leyden; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| The evaluation considers the principle of operation and adequacy of an apparatus submitted as a warning device for insertion in a mixed-gas scuba gas supply circuit wherein the gas is supplied at constant-mass rate independent of depth of dive. The device was found to be satisfactory in principal but, in its prototype form, not adequate for use at flow rates and depths experienced in operational mixed-gas diving. Extensive calibration curves ... |
|
| Buoyancy Control of Open Circuit Scuba. |
20 FEB 1957 |
|
| Authors:
F. G. Jensen; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| The need for a device capable of compensating for the increased buoyancy which an open circuit scuba diver experiences as his air supply is depleted is discussed. Specific design assumptions and criteria are formulated for a 'buoyancy compensator'. Two compensators, one manually operated by the swimmer and the other automatically operated as a function of bottle pressure, are designed and constructed. (Modified author abstract) |
|
| Evaluation of 'Aqua-Pak'. |
05 DEC 1956 |
|
| Authors:
George Haslip; W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FLA
|
| This evaluation was made to determine the suitability for Naval service of the commercially designed and produced SCUBA bottle carrier and harness, 'AQUA-PAK'. The 'AQUA-PAK' was evaluated subjectively by swimming pool runs and the subjects' comments are given verbatim. The results are discussed and lead to recommendations concerning modifications required prior to certification as recommended for Naval service. The mechanical workmanship of the 'AQUA-PAK' is quite good, the design is ... |
|
| Modified Deep Sea Diving Helmet. |
16 NOV 1956 |
|
| Authors:
W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
|
| The evaluation was made to ascertain the operability of a deep sea helmet modified to permit direct return of the exhaust to the surface. If all exhaust gas could be piped back to the surface the acoustical noise emanating from the diver could be materially reduced. The unit as received from the manufacturer was found to be unsatisfactory in that there was insufficient exhaust capacity to permit the diver to ... |
|
| Foxboro Decomputer Mark I. |
15 AUG 1956 |
|
| Authors:
W. F. Searle Jr; NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FLA
|
| An ONR research project at Scripps Institute of Oceanography in 1953 sponsored a theoretical design of a decompression analog computer a prototype of which was subsequently manufactured by the Foxboro Company and presented to NEDU for evaluation. The evaluation indicates that the method of approach is practicable but that the computer as submitted requires extensive refinement to ensure consistency and to extend the range of accuracy (as compared to standard ... |
|
Reports by Author
