PARK AND CEMETERY 
211 
of one part by measure of American Portland cement 
to one part of clean, sharp sand. 
The other part is the gate chamber proper, and 
contains the two sixteen-inch valves, the use of which 
is described further on. This chamber has twelve- 
inch walls on two sides, while the end is an eighteen- 
inch wall for about one-half the height, with a twelve- 
inch wall the remainder. 
Each chamber has for a floor a blue-stone flag four 
inches thick, in order to prevent wash of the concrete 
foundation and digging into the same when cleaning 
out sediment. The structure was covered with two 
similar pieces of flagging, in which were cut holes for 
entrance, and smaller ones for the insertion of keys 
for opening and closing the valves. The walls were 
plastered on the inside with a layer of Portland cement 
mortar one-fourth inch in thickness. The entire struc- 
ture rests on a foundation of Portland cement concrete 
eighteen inches thick, consisting of one part cement, 
three parts sand, and five parts broken stone, extend- 
ing twelve inches beyond the brick walls on every 
side. 
In the summer season it is intended to maintain the 
surface elevation of the lake as near 550 as possible, 
hence the skim overflow, which is through a 24-inch 
pipe culvert under the walk and drive (as will be seen 
on the left of the sketch plan) is placed at 54.5. This 
is accomplished by means of another weir placed a 
short distance above the entrance to the culvert, which 
latter is so placed that in times of freshet the 24-inch 
culvert pipe will be running full before the water in 
the chamber rises to the bottom of tfie cover stones, 
which is about 56.5. Whenever the water rises to 
55.25, however, it begins to flow over the weir between 
the chambers, in which the area of opening is con- 
siderably larger than that of the 24-inch pipe which 
forms the entrance to the chamber. From here it runs 
away through the 24-inch waste pipe, and spills out in 
the bed of a small watercourse which was the original 
outlet of the vicinity. 
In winter it is intended to lower the water in the 
lake five feet, to elevation 50.0, in order to provide 
safe skating. In order to maintain this level, a 16- 
inch iron pipe was built into the wall below the weir 
and provided with a valve. In the fall, before very 
cold weather, this valve is to be opened and the water 
in the lake will then drop to the required level, the 
valve of course, being left open till spring. 
In order to drain the lake, when necessary for the 
removal of undesirable growth, or for other purposes, 
a second 16-inch pipe with valve was built into the 
wall, but at a level with the bottom of the 24-inch inlet 
pipe. The mode of operation is obvious. Unfor- 
tunately the very slight grade of the bed of the brook 
beyond the park boundary made the placing of the 
entire arrangement low enough to drain the lake to 
the bottom, impracticable ; and as it is desired to have 
a maximum depth of eight feet, there will always be 
two feet of water at the bottom which will not drain 
away. It is improbable, however, that it will ever be 
necessary to completely empty the lake. 
Not the least of the advantages of this arrange- 
ment over the ordinary one of bulkhead and flash- 
boards is the entire absence of any unsightly featur.es, 
the whole being below ground, nearly 200 feet from 
the shore of the lake, and on the opposite side of the 
drive, where even the covers of the manholes can be 
planted out and thus screened from view if desired. 
The pipe used was 24-inch Akron tile in 3-foot 
lengths. The manhole frames are cast iron of the 
ordinary type. 
A c 
^ , \o 1 ° . . . . 
Horiz.onial Section St^a/a of/^aar. 
below weir. 
ERRATA. 
In the illustration of the plan for hospital grounds, 
by James Jensen, in our last month’s issue, the scale 
of the drawing should have read one inch =120 feet, 
instead of 20 feet. 
xS e c-/-/ on on A~B. 
