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The "Haga" altimeter measures the angle of elevation
and indicates heights directly for various knwon horizontal
distances or base lenghts.
Several scales are provided and engraved on a rotatable horinzontal
bar.
The 5th is mostly used to determine the gradient in road construction.
The base lenght is selected by turning a knob. Through the
window in the near side the markings of the base lenght scale
in use are easily seen, the scale not in use being invisible,
thereby eliminating any posibility of error in reading, while
the speed of reading is increased.
Thus the instrument has all the advantages of multiple scales
without the usual drawbacks.
The "Haga" altimeter can be used in feet, yard and
metres. You only have to read the indicator on the scale in
the same unit as you measure the base length.
The "Haga" altimeter takes place in a robust leathercase
with carrying strap.
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