Some More Of My Car Boot & Flea Collection. (long Post / Pic Heavy)

[upahill]

Your first photo looks like a tachometer that operates like a car's speedometer - indicating revolution rate on the dial. The operating principle (at least for a speedo) is that the input shaft turns a magnetized disk. A neighboring disk of copper is connected to the needle or dial, which is spring loaded to return to zero. As the magnet turns, it induces eddy currents in the copper, "dragging" it along. The force is proportional to the rotation rate. I'm not sure how the 200, 2000, 20000 scale is selected - possibly gear ratios between the input shaft and the magnetized disk.

Thanks for the explanation. I saw another of these that was branded by Lucas whilst looking it up online so not sure who is rebranded who.

The second item is a turns counter. To measure rate, you touch the end of the shaft to the shaft you want to measure, for a timed interval, then read the number of turns on the dial. The counter is (originally) supplied with a variety of concave and convex rubber tips, for coupling to various sizes and types of shafts. I've used one, but that was back in the late '50s.

This makes more sense, I was wondering how it could count rate with a limited number Doh.

 

[upahill]

Picked up another eBay lot today - quite a few bits I don't already have although may sell on the hardness tools.

A Yokogawa Tachometer



Baty



Baty - yet to work out what these are for...



This Capstan was the gauge I really wanted out of the lot, just for how it looks.
A "Ruston" Crankshaft Alignment Indicator



No makers mark on this



I will either never need this light probe, or need it the day after I have lost it



...






Now comes the fun of learning how to read/use them all

 

[hman]

Such a wide variety of stuff is absolutely fascinating!

 

[dlane]

Car boot ?.

 

[woodtickgreg]

Car boot ?.

It's what we call a trunk, lol.

 

[george wilson]

The last item is a portable hardness tester. Meant for big stuff,though. The little blue "Charity Shop" indicator is a paper gauge,I'm pretty sure.

 

[4GSR]

Yeah, that portable hardness tester, I've dealt with a couple of them over the years. Never could get them to calibrate or read correctly. They always got tossed to the bottom shelf and collected dust. Maybe this one is functional and really works!

 

[george wilson]

The trouble with those portable hardness testers,is they are only good for LARGE stuff. Not like knife blades or other small stuff that I need one for. I wish I still had that Versitron hardness tester we had at work.

 

[upahill]

Picked this up on Sunday for £20, missing the tap wrench though



Picked this up on eBay for £2 but it is very loose. The seller was selling it as broken beyond repair but I think it just needs a bit of TLC.

 

[george wilson]

I might mention that to use the small tachometer already discussed,you touch it firmly to the CENTER of a rotating shaft's end to get the RPM's.