Mystery Palmer C10 piece

Bazv, lovely work ! Bingo. 

Looks like Oracal is probably correct – here is a pic of a C13 Pneu Ram,perhaps used to control Cooling Air Doors/Gills etc.

Oracal, very interesting indeed. P’aps it is a mini ram-solenoid. I will have another look at it. The body is bakelite. It would have enough grunt to flick a switch perhaps. I guess a bakelite body would also cope with high voltage, so anything from radar to ignition related. Mebbe I mistook the ‘brake application’. Kind of a ‘Meteor era’ thing. 

Hi Ed,

The earliest Palmer document that I have that includes a reference to the ‘C 10’ is a post-WW 2 brochure.  

It is stated to be a standard model of pneumatic ram. Stoke 1″, Max force (lbs) to extend = 77, retraction spring = 6.6. Operating pressure 350 psi. Inlet union 1/8″ BSP. Weight 0.33 lbs. Operating temperature range -40*/+90* C.

Further details of other pneumatic rams are given, but nothing for the C 10, so perhaps interwar or WW 2 period?

I have found no reference to the C 10 valve in any of the other Palmer brochures or maintenance manuals that I have.

Thanks Bazv, I reckon it’s something like that but I’d love to see some literature on ‘Palmer C10’ for absolute confirmation. Its found in Australia, so I am thinking a 1930’s pneumatic brake system by Palmer. In this era RAAF Hawker Demons had Palmer hydraulic brakes, while methinks Ansons and Oxfords had Dunlop pneumatic brakes with a vee shaped differential unit. This unit implies a ‘brake lever’ stuck on a control column activating release of air, by connecting a bowden cable to it.

Looks a little like this Brake Differential Unit (single relay) – obviously this one is for a pneumatic system.