Henry C. Adams

Capitolo 34

tides of the same height that the flow of the tides completely it is
identical along the coast in the neighborhood of the outfall, the
diagram should be checked the most distant possible from some
observations of which you/they can be takings to the other states of tides the
same heights. Supposes us we force to know how far a wish of craft
trips if starts twos times after tall water on a 12 ft
tide. From Fig tree. 10 we see that on a tide of this height the
tide turns two hours and a quarter in front of the tide;
therefore two hours after tall water will be four hours and a
you quarter after the turn of the tide. If the craft pits
started with the tide, we see from Fig tree. 11 that it is able
has travelled three miles in four hours and a quarter;  and
escaping this from four miles on which I/you/they am his/her full trip a
whole tide, we see that it will only cover a mile in the two
times and a quarter that you/they are first the current turns to race
back again.

Even if sewage quickly discharged in the sea it becomes this way
diffused as to lose his/her identity, still every now and then the
extraneous substances in him as wood matches the banana
skins, etc. you/they can be traced for a considerable distance;  then
what, as sewage continues to be low in the sea
past touching the outfall, is there formed that that can be described
as a body or column of water that it has possibility of sewage
contamination. If the time during which it is low sewage is
limited twos times and beginnings, say, to the turn of the
current on a 12 ft tide, we see from Fig tree. 11 that the forehead of
this body of water will have come to a point five-eighth of a
mile street when the cessations of unloading;  there will be then a
virtual column of water of a total length of five-eighth of a
mile in that it is contained everybody that rests of the harmful one
matters, travelling through the sea along the course of the
current. We see, further, that to a distance of three miles
by this column it would only employ thirty minutes to pass a determined