| Written up in POB's NEW & NOTABLE |
MODEL 1
| WE ALL KNOW THE DANGERS OF CLIMBING DOWN INTO MANHOLES |
| FIG. 3 |
| FREE SHIPPING & HANDLING ON THE FOLLOWING ITEMS |
| Plumb 100' Fiberglass Tape Price $14.40 |
| LUFKIN 300' Fiberglass Tape Price $49.40 |
HOW IT WORKS
The tool is used along with a scientific
calculator and a Range Pole or Level Rod
to measure the elevations of pipe inverts
by subtracting a calculated distance (A)
from the manhole rim elevation. To figure
the vertical distance (A) you would use
the Trigonometry formula. By taking the
cosine of angle b from the Angle Locater
times the measured distance (C), the
vertical distance down is calculated.
Although the Angle Locater only
measures degrees and not minutes and
seconds, the error involved with that is
very very small since we're only dealing
with short distances. Also keep in mind
that the deeper the invert is - the smaller
the angle is.
The tool is used along with a scientific
calculator and a Range Pole or Level Rod
to measure the elevations of pipe inverts
by subtracting a calculated distance (A)
from the manhole rim elevation. To figure
the vertical distance (A) you would use
the Trigonometry formula. By taking the
cosine of angle b from the Angle Locater
times the measured distance (C), the
vertical distance down is calculated.
Although the Angle Locater only
measures degrees and not minutes and
seconds, the error involved with that is
very very small since we're only dealing
with short distances. Also keep in mind
that the deeper the invert is - the smaller
the angle is.
| Since there are no minutes or seconds there’s no need to convert the angle to decimal degrees. This model has two rod settings which are designed for the Crain SVR/USL 25' Rods and a Range Pole. This model will work with the Sokkia SK 25' Rod too. |
| cos _b x C = A |
/
| b | |
| ˇ |
| NO MORE NEED FOR STRING LINES... MAKES MEASURING THE DEPTH OF THOSE HARD TO GET PIPE INVERTS QUICK AND EASY WITHOUT HAVING TO BOLT IT ONTO YOUR LEVEL ROD OR RANGE POLE. Available here only |
| TM |
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