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IWM photograph with odd caption
- PETERTHEEATER
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30 Jul 2021 13:55 #1
by PETERTHEEATER
IWM photograph with odd caption was created by PETERTHEEATER
This image in in the IWM collection has an odd caption. To me it is a harmonisation rig used to align the gunsight and guns of an aircraft:
www.iwm.org.uk/collections/item/object/205156593
www.iwm.org.uk/collections/item/object/205156593
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- mbriscoe
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30 Jul 2021 15:20 #2
by mbriscoe
Replied by mbriscoe on topic IWM photograph with odd caption
A lot of their captions are poor or just inaccurate. They were usually written on the back of print.
I found some pictures of the WWI gun battery at Corran, they were originally labelled something like Connel, Orkney I think so likely no one had seen them before!
I contacted them and they corrected the captions so worth letting them know. Pity they do not have something like Britain From Above or Canmore where comments can be added.
I found some pictures of the WWI gun battery at Corran, they were originally labelled something like Connel, Orkney I think so likely no one had seen them before!
I contacted them and they corrected the captions so worth letting them know. Pity they do not have something like Britain From Above or Canmore where comments can be added.
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30 Jul 2021 19:37 #3
by Peter Kirk
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
Replied by Peter Kirk on topic IWM photograph with odd caption
It certainly looks like a harmonisation frame, although I can't think what the single lower one is as R/P marker would be not far from the guns, possibly higher than the guns due to the fall off of R/Ps?
As this was answered from memory I will see if I have an R/P harmonisation rig diagram somewhere.
As this was answered from memory I will see if I have an R/P harmonisation rig diagram somewhere.
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
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30 Jul 2021 19:52 #4
by Peter Kirk
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
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Replied by Peter Kirk on topic IWM photograph with odd caption
It seems I have a reasonable memory. This is a diagram of the Hurricane with R/P harmonisation. The drpped marker could be the cine camera.
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
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30 Jul 2021 19:54 #5
by Peter Kirk
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
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No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
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31 Jul 2021 09:52 #6
by PETERTHEEATER
Replied by PETERTHEEATER on topic IWM photograph with odd caption
Yes, I have come across many incorrect captions on images in the IWM collection but there is no simple way to offer a correction or suggestion.
Before an aircraft was 'harmonised' it had to be rigged in flight attitude prescribed as wings straight and level but either nose up or nose down. This was achieved by use of a clinometer which was attached to a Datum Point on (usually) the aircraft fuselage. The aircraft was jacked and trestled to the required angle. The clino was then sighted onto the harmonisation frame to position the frame. The lower left spot in the subject photograph could be the clino/aircraft datum mark.
Before an aircraft was 'harmonised' it had to be rigged in flight attitude prescribed as wings straight and level but either nose up or nose down. This was achieved by use of a clinometer which was attached to a Datum Point on (usually) the aircraft fuselage. The aircraft was jacked and trestled to the required angle. The clino was then sighted onto the harmonisation frame to position the frame. The lower left spot in the subject photograph could be the clino/aircraft datum mark.
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31 Jul 2021 10:26 - 31 Jul 2021 10:28 #7
by mbriscoe
Replied by mbriscoe on topic IWM photograph with odd caption
I think I just filled in their Contact Us form.
Looking around their website, they have policies and statement about all the usual things accessibility, diversity etc but nothing about improving the accuracy of their information!
I have contact with some of their people and access to a couple of their servers but nothing on that part of the IWM.
Looking around their website, they have policies and statement about all the usual things accessibility, diversity etc but nothing about improving the accuracy of their information!
I have contact with some of their people and access to a couple of their servers but nothing on that part of the IWM.
Last edit: 31 Jul 2021 10:28 by mbriscoe.
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