Abstract
The paper gives details of a new simplified type of photometer head incorporating Lummer Brodhun contrast prisms and a sector disc. The use of this head with an integrating photometer is described. When so used, a small portion of the internal surface of the integrator forms one half of the field of view and a comparison disc having an identical surface forms the other half, both surfaces being viewed at the same angle. The advantages of the arrangement are stated.
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