A quick look on the internet suggests electric MKIV indicators of some kind, AP1275A from 1937 lists MKIVA and MKIVa* type respectively as

luminous: 6A/778, 6A887
non-luminous: 6A/777, 6A/888

(PM me if you want the pages from AP1275A)

6A 687 mKIXB to 2600 rpm -have this down as Tiger Moth

6a 450 mkIXD to 4000 rpm -don’t know but I’ve got one with unusual red and green sectors marked on the dial

http://navigator.rafmuseum.org/results.do?view=enlarged&db=object&pageSize=1&id=145311

As usual someone has knocked out the dividers in the box but you can see the outline of the square compartments for the film rolls on the right hand side. This is the first Canada Astrograph box I have seen, thanks for posting. The only astrograph parts I can see in the photo are the film roll and the film can. The US Sperti ones are deeper and have the film rolls in a compartment in the bottom of the box.

The film is nitrate type and needs to be conserved carefully. I did enquire about copying them onto safety film but as it has no sprocket holes I couldn’t find anyone to do it.

This article gives a nice description of the whole setup.

http://www.flightglobal.com/pdfarchive/view/1943/1943%20-%202374.html

One thing I have never been able to understand is how incredibly dim the projection from an Astrograph appears – needs to be viewed in pitch blackness.

They’ll be putting them up all over the Middle East once it gets out that the RAF won’t go near them 😀

A bit more info on the DIY shop – they only point you to the nearest standard shade to your reference and from a fairly restricted pallete. A Dulux Trade Centre did a better job for me, they have a bigger pallete and I could check my reference colour against some sample chips and decide whether to take their suggestion or a neighboring colour. No use unless you want to paint your plane with housepaint though unless it comes up as a BS or similar standard colour.

did anyone else spot that the switch is a CAN. marked (presumably Canadian):rolleyes: one?

Hmm.., looks wireless. See how the scales go in opposite directions, I think if you add two pointers at the 12 and 6 o’clock you will get KC/s at the top and metres at the bottom. (one is 300,000 divided by the other).