Thursday, May 1, 2014

A Spin Hygrometer (Psychrometer)



I suppose these things are pretty much obsolete.

Pictured is an instrument for measuring relative humidity. To use it, the thermometer bulb with the 'sock' on it is wetted with water, then the instrument is spun rapidly in the air until the wet bulb temperature stabilizes. With the aid of a chart, the difference in temperature readings between the wet bulb and the dry bulb tells relative humidity.

The manufacturer, Weksler, is still a going concern. I've emailed them to ask if they can supply the chart.

Meanwhile, I'll stash this in the cabinet where I keep measuring instruments.

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Update -- FRIDAY, MAY 2, 2014

Weksler kindly got back to me. It seems that the instrument is very old indeed, and no support exists for it.

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A Supply Of 1/4" Staples



This will keep me in 1/4" staples for awhile -- I already have a supply of 1/4" staples.

I'll have to install a longer nail in the joist where I hang 1/4" staples, to accommodate this new supply.

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