


Revolution Counter, with five discs
1858

Revolution Counter German electric induction type

Sectioned Revolution Counter MkIV a.(mechanical)

Revolution Counter MkIV by Smith

German clock type revolution counter and indicator

Sectioned Revolution Counter WD

German Revolution Counter by Morell No. 81184

Sectioned Revolution Counter MkV

Jaeger clock type revolution counter

German Revolution Counter by Dr. TL.Horn Leipzig

Revolution Counter

Combined Revolution counter and stop watch in case

Small Hand revolution Counter

Casagrande liquid-limit apparatus

German Revolution Counter

TEL' German revolution counter

'TEL' German Revolution Counter

Improved form of mechanical counter, late 19th century.
late 19th century

Mechanical counting device, c 1900.
circa 1900

Aircraft engine revolution counter.

Revolution counter, inscribed with numbers
1862
revolution counter used on a waterwheel
Casagrande liquid-limit apparatus
1967
revolution counter
1960