## Abstract

The factors which limit the recording speed and the resolution of infra-red spectra are reviewed, and methods offering increased overall photometric efficiency are examined.

The attainment of greater efficiency by means of multi-slit arrangements is discussed and the experimental results are described.

© 1949 Optical Society of America

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### Equations (2)

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(1)
$$\begin{array}{c}{\mathit{\int}}_{0}^{1}{f}_{m}(t){f}_{n}*(t)p(t)dt={\delta}_{m,n,}\\ \begin{array}{lll}{\delta}_{m,n}=\frac{1}{4}\hfill & \text{for}\hfill & m=n,\hfill \\ {\delta}_{m,n}=0\hfill & \text{for}\hfill & m\ne n,\hfill \end{array}\end{array}$$
(2)
$${\mathit{\int}}_{0}^{1}\stackrel{m}{\text{\Sigma}}{f}_{m}(t){f}_{m+s}*(t)sin2\pi t=0.$$