The main diaphragm can be made using one from a 2286cc Series 2 or 3 Land Rover, once you remove its centre spindle. The diaphragm matches up in diameter & with the required holes. For the compensating diaphragm I just used a piece cut from an old door seal of an autoclave.
Yet on the other hand. Military Engineering. Vol I. Part II. Engineers in Battle. 1953
Then again. Equipment Regulations. Pam No.8. Nomenclature and Coding of "A" "B" "C" and "D" Vehicles and Mobile Equipments amended 1967
Could it be that the blurring of changeover was due to an RE persistence with "Assault" whilst the adoption of "Armoured" was by RAOC?
I don't have a particular stance on the abbreviation myself. But looking at the result of an FOI request made last year into Asset Codes, the spreadsheet includes these entries:
Ian I believe this may be a very interesting & unusual find! You do keep finding these curiosities!
I have a Vocabulary of Army Ordnance Stores Section LV6/MT3 1943 it illustrates L/WD/H1 which might seem to be the Lucas version. It has the lower 2/3 of the light blanked over & the aperture facing a vertical screen attached to the hood. So that you cannot see light if you were stood in front of the vehicle, as it should be for a normal blackout light.
B/WD/HI is listed & illustrated & shows a similar blackout mask over the lens. But yours is not like that either the mask is missing or it was the modification to B/WD/H1-UV that had no mask & a 12v.ultra-violet bulb.
I covered UV driving from page 14 in here:http://www.hmvf.co.uk/pdf/Tabby01.pdf
Have you looked at the bulb, is it a UV one?
Site seems to have closed down today.
For the last month it has been very difficult to log into, although I did manage to renew & get my new card. When I have got in I have tried to register attendance at particular events & extract a Risk Assessment but it won't accept an event registration. I did email them yesterday & I know its early days but was a bit concerned now the site has gone. Anyone know what the story is?
Andy not specifically but BATES AESPs start at 7010-C up into 7035-C. I notice some BATES installations are used in MLRS, so perhaps info may be a bit thin on the ground?
Iain that's a very comprehensive overview of its operation.
I won't quote from it for fear of copyright infringement. But some sentences would on the face it seem probably to perhaps maybe identical to some of the instructions in AC No.70947 :-X
1990 is good time line for the Mk 3. I have COSA W10 1986 that only lists Mk 2. In the 1993 edition it lists Mk 2 & Mk 3.
Does the chute have a helical spring in it to push it open? I can remember as a boy buying chutes of various colours that were sold as auxiliary chutes ie they opened up to then exert a tug to trigger a large chute to open.