Mechanical Drawing 2 Ad Slide Rules Dwyer Pennwalt Pressure Flow PSI Air
Here are 2 advertising slide rules purchased from an estate sale:
- from DWYER Instruments, Inc. of Michigan City, IN, makers of Flow meters, wind instruments, air velocity instruments... One side is Pressure English/Metric; the other is Flow-Velocity English/Metric. Heavy shiny cardboard. Slight wear around 1" mark on top edge Pressure side. Very good condition otherwise.
- from Wallace & Tiernan Div of PENNWALT, Belleville, NJ, makers of dials, gauges, calibrators... One side is a Pressure Converter, the other gives Altitude vs. Pressure. Plastic. Excellent condition.
$12.00 Shipping $5.00 -Will Ship United States Lower 48 States Only