Metric Imperial holograph rule

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Metric Imperial holograph rule

This topic has 10 replies, 6 voices, and was last updated 23 June 2021 at 22:08 by Robert Atkinson 2.

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23 June 2021 at 08:10 #550959
sparky mike
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@sparkymike
I found a 12" plastic holograph rule in my late father's wooden tool chest.

Is it still possible to buy these and if so , where from ?

Seems like a good idea to me. You just tilt the rule to get either metric of imperial figures.

What age would this be from, 70's ?

Mike.
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23 June 2021 at 08:10 #20341
sparky mike
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@sparkymike
23 June 2021 at 08:47 #550963
sparky mike
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@sparkymike
Edited By sparky mike on 23/06/2021 08:50:06
23 June 2021 at 09:17 #550972
Nigel Graham 2
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@nigelgraham2
I must admit that is the first time I have heard of these, but unless it was heavily patented, one possible maker is Blundell–Harling, of Weymouth.

This is an independent firm that used to make slide-rules but with the loss of that market, it turned successfully to what it does now, manufacturing drawing-boards and many types of measuring-rules and scales.
23 June 2021 at 13:51 #551014
Nigel Taylor 2
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@nigeltaylor2
I have a 6" version of this rule. I obtained it in a 'swap' with someone at school in the early '70s. Possibly this was given out as a gift at a trade exhibition or similar. I don't know the significance of the name on the reverse.
23 June 2021 at 16:01 #551028
Nigel Graham 2
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@nigelgraham2
The name is " significant " as almost certainly the manufacturer, but whether the firm still exists is another matter.
23 June 2021 at 19:15 #551074
sparky mike
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@sparkymike
I just found a name on the rear, so small I had missed it.

It is made by Varivue. MFG USA. Pat.NO. 2.815.310 …. also Pat no.2.399.938 (the 3 might be 2 or another number. A job to read.)

Mike.
23 June 2021 at 20:14 #551080
old mart
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@oldmart
I've never seen one, are you sure it is a holograph and not a diffraction grating?
23 June 2021 at 21:32 #551094
sparky mike
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@sparkymike
It seems to work like the images on some credit cards. There is another name for it but can't remember it.

One for sale on UK Ebay right now but none on the US Ebay, which is the place where I thought they would be found. With the US Pat. number it should be possible to look that up and it will describe the technique in detail I would think.

Mike.
23 June 2021 at 21:56 #551096
HOWARDT
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@howardt
I used to have one, went the way of most advertising items. Can’t remember where I got mine.
23 June 2021 at 22:08 #551098
Robert Atkinson 2
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@robertatkinson2
Not a hologram but a set of grating like lenses with two printed images below. Changing the viewing angle causes one image or the other to appear. The lenses were normally just embossed plastic sheet.
More commonly found in childrens novelty items were the illusion of movement is produced.

Not very much use for preceion meaurement, at least one scle wll have parallax error by design.

Robert G8RPI.

Edited By Robert Atkinson 2 on 23/06/2021 22:27:04
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