(under subclass 409) Subject matter wherein the length of the light path through the liquid may be varied, as by inserting a light-transmitting member of constant light-transmitting length into the liquid to a desired depth and passing light through the liquid and the light-transmitting member in series.
(1) Note. Scales correlated with the change in the amount of the liquid in the light path are present in the disclosed device but are not always included in the claims.
(2) Note. Subcombinations of the devices are classified herein when they are not provided for elsewhere.
(3) Note. Included in this subclass are colorimeters of the
"Duboscq" type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
441+, for turbidity measurements which may utilize the same structure as found in 413.
