512 REPORT— 1890. 
ments have been devised by military men and others to satisfy either the 
one or the other of these requirements, but we believe the instruments 
just described to be the first that have been designed to satisfy both 
requirements. 
Second Report of the Committee, consisting of Sir J. N. Douauass, 
Professor W. C. Unwin, Professor OSBORNE REYNOLDS, and 
Messrs. W. TopLey, E. LEADER WILLIAMS, W. SHELFORD, 
G. F. Deacon, A. R. Hunt, W. H. WHEELER, and W. ANDERSON, 
appointed to investigate the Action of Waves and Currents on 
the Beds and Foreshores of Estuaries by means of Working 
Models. 
[PLATES J-XVIII.] 
Tue Committee held a meeting in the City and Guilds of London 
Institute and considered the results obtained since the last report and 
the proposals of Professor Reynolds for the continuation of the investiga- 
tion, which were approved. 
At a second meeting, held at the Owens College, Manchester, it was 
arranged that Professor Reynolds should draw up a report on the results 
obtained. 
At a third meeting, held in the committee room, Section G, at Leeds, 
the report submitted by Professor Reynolds was considered and adopted. 
On Model Estuaries. 
By Professor Osporne Rernoups, F’.R.S., M.Inst.0.L. 
CONTENTS. 
SECTION I.—Zntroduction. 
ARTICLE PAGR 
1. Objects of the continued investigation m : ' ; - ; - 513 
2. The work accomplished : : 513 
3. The systems of conducting the experiments, observing and recording the 
results . 5 : - . 3 : . : . : . - 513 
SECTION II.—General results and conclusions. 
4. The limits to similarity in rectangular model estuaries . . . 514 
5. The causes of change in the manner and rate of action . = : . 515 
6. Criterion of similar : action . - c - . - 516 
7. Critical value of the criterion for rectangular estuaries . : 4 . 516 
8. Critical value of the criterion for V- shaped estuaries . ‘ 0 ‘ . 517 
9. Conditions under which the criterion = 0:08 5 : . - f s.. BLT 
10. Distribution of sand in V-shaped estuaries. ¢ : ; ; ‘ » DLT 
11. Distribution of sand with a tidal river z : : x 5 : . 518 
12. The effects of land water . : . 518 
13. The deposit from the land water in the upper portion of the river 7 - 519 
14, Experiments on a model of the Seine. .Mengin . . < ‘ . 519 
15. Recommendations for further seats ; : : ; . s 519 
SEcTION IIIl.—Lxtensions and modifications of the apparatus. 
16. The general working . - 520 
17. Adaptations and extensions for V- shaped estuaries in Tanks A, 'B, C, D . 6520 
18. Adaptations and extensions for V-shaped estuaries in Tanks H, F, F’ . 520 
19. The numbering of the cross sections in Tanks C, D, B, F . : é . 520 
20. Apparatus for regalating the land water . ; : ¢ : ‘ . 621 
