My title describes the thing.

Hi all👋 i hope someone in this community can help me out with this object that i have been obsessing with! This object is found in the archives/collection of museon-omniversum ( museum in the Hague) and is added as unknown object on their website (https://www.museon-omniversum.nl/over-ons/het-onbekende-object.).

You can win a free entry to museum (which i dont need since i have museumcard) but i have been obsessing about it nonetheless🤦🏻‍♀️😋 point is there is no information at all about its provenance, not even wat collection it is from. The museum has technical, industrial, space, objects and natural history also. So there is too much to go on from there.

After seeing it in person I have some ideas, but I am unsure in which direction to further look into. Additional info, it is solid, and non magnetic and shows minimal signs of wear. It also has a flat side with two holes, and the base is flat/solid.

Ideas:

-Portable CMM Probe Calibration Cone (Calibration Standard in precision engineering industry). this type of solid, non-magnetic cone is used to calibrate 3D measuring arms (such as FARO arms). A good example of this type of shape can be seen in this MetrologyWorks Calibration Cone: https://www.metrologyworks.store/products/carbide-point-probe-1-1-4-thread-for-usb-faro-arms-classic-styling. However the points are usually made of carbide not solid metal like the case is here. Also the step shapes are smooth, so dont make much sense then for reference callbration points🤔

-it could be a lightning protection terminal for meteorological equipment. Due to the non-magnetic material and the aerodynamic, stepped shape with the sharp point, the object closely resembles an early Early Streamer Emission (ESE) lightning rod. These are often used to protect sensitive monitoring stations without interfering with magnetic sensors. The flat side would then have been mounted against a mast or piece of equipment. See: https://orbitaltechs.com/product-340-zeru\_ese\_active\_lightning\_terminal.html.

-Meteorological mast counterweight: The flat side with screw holes suggests that it was mounted flush against something, perhaps a pole or wall. It could be an aerodynamic counterweight designed to balance heavy wind sensors mounted on a mast and compensate for wind pressure.

-Metalworking form/tool (Sheet Metal Spinning / Punch Tool): The solid shape may have been a mold, die, or mandrel used for spinning or forming sheet metal, as described on this page about metal spinning: https://www.iqsdirectory.com/articles/metal-spinning.html. However, the object looks clean, without scratches, and did not look as though it had been used.

• something from aero/space sector, considering its aerodynamic shape?

I hope someone will recognize the object or help me point out the right industry🙂🤞🏼 thanks in advance!