Henry C. Adams
Capitolo 23
in to cover some particular distance it is known and the length of
trips during some quarter-time that period multiplied within four gives
the speed of the tide to those miles of time in for now.
The method to have a job in to verify the exact position of
the craft is a matter that requires accurate at times
consideration, and it is dependent on the degree of accuracy
in demand according to the importance of the scheme and the
situation of city of neighbouring, frequented beaches, oyster
beds and the other circumstances probable to injuriously be stricken
from some possible or probable sewage pollution.
A method is to follow the craft in a small boat that brings a
sea compass that the card has balanced to remain in a
horizontal position, disrespectful of furnishing of point and rolling of
the boat, and to simultaneously observe the carrying one of two
prominent miliary stones, the position of what on the plan it is
known, to each of the quarter-time periods to that the
observations will be takings. This method gives only a lot
approximate results, and after having checked the value of the
observations served as his/her use with contemporary observations,
taken from he/she wants to say of theodolites on the beach, the writer
abandoned the system in favour of the method of theodolite that,
however it asks for a greater personnel, and it is therefore more
expensive. In every case it is necessary to assume a boat to
follows the craft, not only as to recover him/it at the end of
the job of every day, but mainly to approximately assist in
locating the craft that can more quickly be found then when
crossing through the telescope of the theodolite. The boat
you/he/she should be kept approximately 10 fts to 20 fts from the craft on the side
further removed from the observatories, except when afloat of surface
you/he/she has been using for verifying the effect of the wind, when the
boat should be kept leeward to of the craft. Even if evidently
with a great boat the observations can be undertaken through
time rawwer than it is still an important point the