Measuring, by methods of general application, displacements, e.g. of the pointer of a measuring instrument, which are caused by variables of which the measurement is not covered by this sub-class, is dealt with in sub-class Fulltext... Hierarchy... Expanded...G01D.
The groups of this sub-class are distinguished by the means of measurement which is of major importance. Thus the mere application of other means for giving a final indication does not affect the classification.
Machines operated on similar principles to the hand-held devices specified in this sub-class are classified with these devices.
INDICATING OR RECORDING IN CONNECTION WITH MEASURING IN GENERAL; DEVICES OR INSTRUMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUB-CLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR (means structurally associated with lightning or other overvoltage discharging apparatus for recording the operation thereof Fulltext... Hierarchy... Expanded...G01R; displaying information in general Fulltext... Hierarchy... Expanded...G09F; recording in a way which requires playback through a transducer Fulltext... Hierarchy... Expanded...G11B)
MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (sensing temperature changes for compensating measurements of other variables or for compensating readings of instruments for variation in temperature, see Fulltext... Hierarchy... Expanded...G01D or relevant sub-class for variable measured; radiation pyrometry Fulltext... Hierarchy... Expanded...G01J; testing or determining physical or chemical properties of materials by measuring temperatures Fulltext... Hierarchy... Expanded...G01N; compound sensitive elements, e.g. bimetallic, Fulltext... Hierarchy... Expanded...G12B 1/02)
MEASURING FORCE, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (sensing pressure changes for compensating measurements of other variables or for compensating readings of instruments for variations in pressure Fulltext... Hierarchy... Expanded...G01D or relevant sub-class for the variable measured; weighing Fulltext... Hierarchy... Expanded...G01G)
In this sub-class, (1) the term "investigating" means testing or determining, and (2) the term "materials" includes solid, liquid, and gaseous media, e.g. the atmosphere.