Densitometer

Claim 1

A multiple colorimeter for obtaining a record of the amount of color or turbidity in a large number of samples simultaneously comprising in combination: a. a generally light tight chamber, b. a source of light located near the top of said chamber, c. means for controlling said source of light, d. a photosensitive photographic paper located near the bottom of said chamber, e. slots on each side of said chamber, located between said light source and said photographic paper whereby a slide can be passed through said slots intercepting said path of light, f. a slide adapted to pass through said slots in light tight relationship, g. said slide having a length of approximately twice the width of said container and being divided into two equal sections including a first section having a plurality of pockets for holding sample tubes and a second section being a blank section whereby said slide can be moved to a first position wherein said blank section intercepts the light from said light source to said photographic paper while samples are loaded into said sample section and said slide can then be moved to a second position wherein said samples are interposed between said light source and said photographic paper.