My guess for the “clock” is a photosurvey intervalmeter, possibly a type B4. Used to trip the camera at set intervals for the mosaic pictures. Varies timing as set by speed and altitude of the recce a/c.

I doubt it.

Those two wheels on the front are the reduction mechanism to drive the hour hand. Pressed frame, teeth and an open spring mean a very cheap clock – If it had two springs I would have said it was a Smiths alarm clock

Richard

In actual fact, it reduces the propensity to form a crack from the thin cut edge. It reduces the chance of vibrations flexing the original thin flat plate at that point and thus causing fatigue cracks through the vibration. The flange, in effect, does stiffen it to reduce the flexibility.

We are also being very loose with terminology. As the flange is perpendicular to the plane of the platework, it is effectively increasing the thickness of the component and stiffening it around two of the axes at the expense of the third. In fact, as we are into the ‘breadth times depth cubed’ bit of elasticity, you get a huge increase in stiffness around these for not much loss on the other.

Richard

That reminds me of something

Richard

I’m not sure that there is an inconsistency here. Surely ‘phoning the airfield is the correct way – if they tell you to eff off and mind your own business, that is the answer you will get. Why ask a forum to do this for you?

Richard

{snip}

someone had already marked out the runway

{snip}

Matt

It looks like the runway on Lundy is permanent:

http://maps.google.co.uk/maps?q=lundy&hl=en&ll=51.171056,-4.669189&spn=0.005752,0.016512&sll=52.8382,-2.327815&sspn=11.359053,33.815918&t=h&hnear=Lundy&z=17

Richard

As far as I can remember, it was a near solid blob of polystyrene cement with some grey plastic in the middle. I must have loved it though as I am still doing it!

Richard

Great photos there – the last two – possibly a Tempest V doing the chasing and tipping? Not much detail left in the photos from those angles!

That one is on Wikipedia – identified as a Spitfire!

As we are still in defeating flying bomb territory, a Typhoon equipped with rockets for ground attack:

Richard