Measuring and testing – Hardness
Patent
1979-05-14
1982-03-09
Gill, James J.
Measuring and testing
Hardness
G01N 350
Patent
active
043182976
ABSTRACT:
A novel automatic test measuring apparatus of the pendulum variety for readily and easily determining film and the like hardness is adapted to automate all the operations necessarily preceding the commencement of a measurement stage using, in connection therewith, a recording unit or printer to supply the operator with the numerical results of all the measurements without personal manipulation(s). In making a measurement, the necessary time count for passing from amplitude .alpha. to amplitude .beta. is effected by means of a photo-electric cell. This records the passage of a pendulum arm having a predetermined period during the time that the oscillation amplitude is higher than .beta.. The involved count gives the measured time necessary for the measurement. The automatic apparatus advantageously reduces error relating to each measurement and increases the number of measurements to be effected on one and the same test film to yield a vastly more reliable mean statistical value. Provision may be made to simultaneously test several films, either by simultaneous of successive mountings of a plurality of films whose hardness is being measured.
REFERENCES:
patent: 2757535 (1956-08-01), Monk
patent: 2890585 (1959-06-01), Albrecht
Ser Jean-Claude
Yquel Jean-Pierre
Zaffran Christian
"L'Oreal"
Gill James J.
Rudy N. Jerome
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