Ahhhhhhh.......NOW I UNDERSTAND!!!!
Thanks so much for these scans and photos - they explain the mystery to me very clearly.
There must be some very good gaskets around those air "holes" in order to prevent any leakage of air and reduced suction where they join the lower portion to the upper portion. I wonder why they did not just exhaust the air through the top of the motor housing....that would have been simpler solution, methinks.....hmmm....
Thanks so much for these scans and photos - they explain the mystery to me very clearly.
There must be some very good gaskets around those air "holes" in order to prevent any leakage of air and reduced suction where they join the lower portion to the upper portion. I wonder why they did not just exhaust the air through the top of the motor housing....that would have been simpler solution, methinks.....hmmm....