458 SEVENTH REPORT—1837. 
extending about 25 miles down to the outer Cumbray Island, 
where it terminates. The whole of this space was embraced by 
the observations. : 
Plate VIL. contains a plan of the river Clyde; the stations at 
which tide gauges were erected and observers placed are marked 
in the plan. Nine different stations were occupied; the first 
of these was at the harbour at Glasgow, immediately below 
which, the river is for about 5 miles of nearly uniform width 
and depth, and in this division were three stations, No. I., IL, 
and III. Thenext division of the river is wide, irregular, and of 
variable depth, comprehending stations III., 1V., and V. The 
third division of the river is deep and broad from station V. to 
station VII. The river then opens out into a wide and deep 
frith, and at a distance of about 5 miles further down, on op- 
posite sides of the frith, were placed stations VIII. and X. 
Station IX. was at the light-house on the outer Cumbray Island, 
which stands at the mouth of the frith. A great variety of 
channel was thus included in the observations. 
The observations were made with a tide-gauge, constructed 
for the purpose of preventing the oscillations of the waves of 
the surface; a glass tube traversed the scale; the tube open 
abdve terminated below in a stop-cock, by which the aperture 
was regulated, and which communicated with along narrow 
pipe descending into deep water; the indications of this 
gauge were free from inconvenient oscillation, even in a rough 
sea, to which it was exposed. The scale of the gauge was so 
constructed as to be read with ease at a considerable distance. 
This gauge is recommended as one that can be used with ease 
and perfect accuracy by a telescope from a great distance, and 
which might therefore afford the means of making observations 
in situations where otherwise it would be impracticable. The 
indications of the gauge were written down every five minutes 
during the entire progress of one tide wave each day, and of 
two successive tide waves on the evening of each Friday. The 
following table contains the observations of heights, all referred 
to the same level, as accurately determined by Mr. Kyle for the 
first seven stations, and as interpolated for eight and nine. 
