5.1.3. On the calculation of effective intensity, a revised approach / J. Terrence Montonye -- 5.1.4. A case for the short flash : a realistic equivalent fixed intensity calculation for flashing point sources / David A. Naus -- 5.2.1. On the influence
of the surrounding field on the recognition of signal lights / P. Jainski, H.J. Schmidt-Clausen -- 5.2.3. Sensitivity of daytime leading lines / P. Blaise -- 5.2.4. Sensitivity of leading lights for vertical angular separations of from 5 to 20 milliradians / P. Blaise -- 5.2.5. Retro-reflectance / J.A. Ciccolella -- 5.3.1. Electronic measuring device for the determination of the grinding accuracy of optical systems for lights / P. Jainski, W. Gaschler -- 5.3.2. Optical apparatus for the new light at Caloundra Head, Queensland / Dept. of Shipping and Transport, Australia -- 5.3.3. A revolving electric pedestal with standby acetylene light source / N.L. Spottiswoode.
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