436 SEVENTH REPORT—1837. 
make use of them much in the same way as if he had himself 
made the experiments. The wave having been generated was 
first observed in the glass index, fig. 6, placed near to the gene- 
rating reservoir; then it passed under the transit station where 
its transit was observed, and the time registered either by one 
or two observers, and then its height was cleared in another 
glass index near the other reservoir; the wave having under- 
gone the first reflection was returned, and the same observations 
were repeated during a number of successive reflections. See 
Experiments page 465—491. 
The collection of tables at the end of this report gives the 
history of a series of waves in which these phenomena are care- 
fully recorded. 
Explanation of Tables.—F¥or the sake of ready reference, 
there is given at the beginning of each table (see Wave 1.) the 
approximate depth of the fluid, and the date of experiment, 
thus : 
2d Aug. 1837. Wave I. Depth, 4 inches. 
The next line contains the mode of generation, written thus : 
Created by reservoir A. Volume of added fluid = 153-5 inches. 
The reservoir A, fig. 1, Plate I., the detached chamber B, fig. 9, the 
solid parallelopipedon C, fig. 10, and chamber D, have already 
been described, and are successively referred to in the manner 
now stated; and in Wave IX. for example, the means of gene- 
ration was the flat sluice in fig. 8, held in the hand, passed 
down to the bottom of the fluid, and moved horizontally so as 
to displace the fluid from the reservoir A. 
The method of observing is next given, as for example in 
Wave I. 
Transits observed directly at index, and without reflection— 
when the unassisted eye of the observer detected by in- 
spection the transit of the ridge of the wave passing the place 
of the indices at y. fig. 6; but in other cases the eye was ar- 
rested by the refiected image in the transit apparatus already 
described, figs. 2,3, 4, and 5, as for example in Wave V., 
where we have 
Transits observed by the reflected image at the central station. 
The next line gives the depth of the fluid in the channel, pre- 
vious to the commencement of the experiment, first of all as 
