£30
A 1940s Boulin Strobomeca (Tachometer) test instrument. Handheld mechanical (clockwork) stroboscope for measuring the RPM of rotating mechanical devises, such as propellers, etc. Marked Boulin Instrument Corp. New York. Together with a small number of postcards from early to mid 20th Century relating to motor racing at Brooklands, Sussex scenes and villages including Lindfield, Haywards Heath, Burgess Hill, etc. Plus early postcards of the building of the Panama Canal, railway related, etc. VGC. £30-50
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