Unclassified 



Security Classificat i on 



KEY WORDS 



ROLE WT 



Flow visualization 

 Hydrogen bubbles 

 Water tunnel 

 Streaklines 



INSTRUCTIONS 



\. ORIGINATING ACTIVITY: Enter the name and address 

 of the contractor, subcontractor, grantee. Department of De- 

 fense activity or other organization (corporate author) issuing 

 the report. 



2a. REPORT SECURITY CLASSIFICATION; Enter the over- 

 all security classification of the report. Indicate whether 

 "Restricted Data" is included. Marking is to be in accord- 

 ance with appropriate security regulations. 



2b. GROUP: Automatic downgrading is specified in DoD Di- 

 rective 5200. 10 and Armed Forces Industrial Manual, Enter 

 the group number. Also, when applicable, show that optional 

 markings have been used for Group 3 and Group 4 as author- 

 ized. 



3. REPORT TITLE: Enter the complete report title in all 

 capital letters. Titles in all cases should be unclassified. 

 If a meaningful title cannot be selected without classifica- 

 tion, show title classification in all capitals in parenthesis 

 immediately following the title. 



4. DESCRIPTIVE NOTES: If appropriate, enter the type of 

 report, e.g., interim, progress, summary, annual, or final. 

 Give the inclusive dates when a specific reporting period is 

 covered. 



5. AUTHOR(S): Enter the name(s) of author(s) as shown on 

 or in the report. Enter last name, first name, middle initial. 

 If military, show rank and branch of service. The name of 

 the principal author is an absolute minimum requirement. 



6. REPORT DATE; Enter the date of the report as day, 

 month, year; or month, year. If more than one date appears 

 on the report, use date of publication. 



7a. TOTAL NUMBER OF PAGES: The total page count 

 should follow normal pagination procedures, i.e., enter the 

 number of pages containing information. 



76. NUMBER OF REFERENCES: Enter the total number of 

 references cited in the report. 



8a. CONTRACT OR GRANT NUMBER: If appropriate, enter 

 the applicable number of the contract or grant under which 

 the report was written. 



86, 8c, & 8d. PROJECT NUMBER: Enter the appropriate 

 military department identification, such as project number, 

 subproject number, system numbers, task number, etc. 



9a. ORIGINATOR'S REPORT NUMBER(S): Enter the offi- 

 cial report number by which the document will be identified 

 and controlled by the originating activity. This number must 

 be unique to this report. 



96. OTHER REPORT NUMBER(S): If the report has been 

 assigned any other report numbers (either by the originator 

 or by the sponsor), also enter this number(s). 



10. AVAILABILITY/LIMITATION NOTICES: Enter any lim- 

 itations on further dissemination of the report, other than those 



imposed by security classification, using standard statements 

 such as: 



(1) "Qualified requesters may obtain copies of this 

 report from DDC " 



(2) "Foreign announcement and dissemination of this 

 report by DDC is not authorized. " 



(3) "U. S. Government agencies may obtain copies of 

 this report directly from DDC. Other qualified DDC 

 users shall request through 



(4) "U. S. military agencies may obtain copies of this 

 report directly from DDC. Other qualified users 

 shall request through 



(5) "All distribution of this report is controlled. Qual- 

 ified DDC users shall request through 



If the report has been furnished to the Office of Technical 

 Services, Department of Commerce, for sale to the public, indi- 

 cate this fact and enter the price, if known. 



11. SUPPLEMENTARY NOTES: Use for additional explana- 

 tory notes. 



12. SPONSORING MILITARY ACTIVITY: Enter the name of 

 the departmental project office or laboratory sponsoring (pay- 

 ing lor) the research and development. Include address. 



13. ABSTRACT: Enter an abstract giving a brief and factual 

 summary of the document indicative of the report, even though 

 it may also appear elsewhere in the body of the technical re- 

 port. If additional space is required, a continuation sheet shall 

 be attached. 



It is highly desirable that the abstract of classified reports 

 be unclassified. Each paragraph of the abstract shall end with 

 an indication of the military security classification of the in- 

 formation in the paragraph, represented as (TS), (S), (C), or (U). 



There is no limitation on the length of the abstract. 

 ?r, the suggested length is from 150 to 225 words. 



How- 



14. KEY WORDS: Key words are technically meaningful terms 

 or short phrases that characterize a report and may be used as 

 index entries for cataloging the report. Key words must be 

 selected so that no security classification is required. Identi- 

 fiers, such as equipment model designation, trade name, military 

 project code name, geographic location, may be used as key 

 words but will be followed by an indication of technical con- 

 text. The assignment of links, roles, and weights is optional. 



Unclassified 



Security Classification 



