What is this and what is it used for

[Ben]

I do not see the screwdriver tip that I would expect but I concur that one revolution of the "key" will move the count up one notch.

Still baffled as to what it turned where we would have to count up to 100.

Ben

[Henrik_Volkers]

@Ben, Jeff: It's a PMT , the Dynode arrangement is for higher speed. See http://www.hamamatsu.com/eu/en/product/category/3100/3001/index.html

James

no, it is not a screwdriver , and the shaft can rotate.

[JÞB]

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@Henrik_Volkers wrote:

@Ben, Jeff: It's a PMT , the Dynode arrangement is for higher speed. See http://www.hamamatsu.com/eu/en/product/category/3100/3001/index.html

James

no, it is not a screwdriver , and the shaft can rotate.

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I expected the dynodes to be in-line with the electron beam.  You learn something new every day!

[Ben]

New guess!

It is a rotation counter that can be used to count shaft rotation and when combined with a stop watch can be used to measure shaft rotation speed.

Ben

[altenbach]

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@Henrik_Volkers wrote:

no, it is not a screwdriver , and the shaft can rotate.

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Yes, it looks like a mobile hand tool to measure rotation speed. Maybe some old steam engine or water mill has a hole in the axle where you would press this in for a given amount of time, then calculate the speed from the time and rotation count.

The tip looks like self-centering and tapered to prevent binding, but engages securely in a matching axle feature.

EDIT: Ben was a bit faster, but maybe we're both wrong :D)

[Ben]

Yes Christian see here.

A rubber tip like a pencil eraser would be attached to interface with the shaft.

Q: How long unitl a pencil shows up as the challeng in this thread?

Henrik,

Excellent collection you have there!

Thank you for sharing.

Ben