Hi ppl,
I recently picked up a box of old British car bits, and in it are two gauges labelled "Air". One is a Smith's, a dual gauge. The other is a generic thingie that looks like a more modern Smith's.
The scales are dual units of Lb/cu in, and kPa. Both have an air inlet (of course) and the guts connect this to a spiral copper flat tube. In the Smith's it rotates a teensy gear to move the needle. (There are two sets of guts in the Smith's).
Pardon my incredible ignorance, but, what is this measuring? I thought vacuum, and indeed one needle in the Smith's bounced around a very little bit, once connected to a manifold port on my little Spit, but the other was as stuck as I am on this.
Anyone know the principal of operation with this copper coil thingie?..and of course...what they are measuring?
TIA, Mark
Mark
---------------------------------------------------- To de-spam the rtn addr, take out the "garbage."