110VAC Motor turns recording drum (one revolution per week). Writing arm moves as storm comes through.

We do not know if it's still calibrated, but it did move significantly (down) when the last storm came thru, and came back up in a few days.

Will be shipped disassembled (drum cylinder, 3-stage barometric sensor) due to sensitive/fragile components.

Instructions for assembly are easy and well documented in the PDF instruction manual.

Eyedropper ink bottle is about 1/3 full, the writing arm triangular nib is empty may need cleaning when re-inking.

We used xeroxed charts over the years, but we see that some are still on the market incl ebay.

We will include the old UniMag 3-stage sensor for thoroughness.

When hurricane Bob came thru a few decades ago, the writing arm went to the bottom of the chart almost in a vertical line.

PDF instruction booklet on request.

The outstanding feature of the Weather-Hawk

STORMOSCOPE Barometer is its adaptation of the

UNI/MAG movement (UNIversal altitude range/

MAGnified pointer motion), an exclusive development

by Taylor, leader in this industry since 1851.

Three of the new UNI/MAG capsules are stacked

to make up the temperature compensated movement.

Pen motion for a given barometric pressure

change is increased by 50%. Threshold sensitivite,

hysteresis error and dead band have been reduced

so there is practically no observable lag in reversal

of pen motion as a pressure change occurs. A new

pen arm is provided to reduce pen pressure.

The small pressure changes which are so vitally

important in making local forecasts of coming

weather are readily apparent on the chart. In

areas where the changes are normally small in

magnitude, and not particularly obvious on the old

style recording barometer chart, the trace provided

by the new movement makes them easily readable.