0 a small plate, for example one that you put your bread on when you are eating the main part of a meal --
The spectrum will be seen on the ground glass, probably equal in dimensions to that of a quarter plate.
The red should just be seen along the left edge of the quarter plate.
There is really no difficulty in cutting strips a quarter of an inch wide, the lengthway of a quarter plate.
A quarter plate can thus be cut up into strips to yield about a dozen comparative experiments.
