Records of Bioluminescence — Boden and Kampa 
231 
tion of the moon varied between 21° and 31° 
during this period. The interference filters 
employed were G. A. B. filters, manufactured 
in Liechtenstein, with half-peak band widths 
of about 10 m/z. Block filters are incorporated 
to reduce stray light and eliminate secondary 
transmission peaks. Peak transmissions, meas- 
ured by a Beckman Model DU spectrophotom- 
TOTAL IRRADIANCE IN jJWATTS / cm 2 
Fig. 1 . Tracing of total irradiance recorded on Leeds and Northrup Speedomax recorder by bathyphotometer 
without color filters. Spectral sensitivity of the 931-A photomultiplier tube is shown in inset. This is from manu- 
facturer’s specifications and is an average curve. The record was made at 2400 hours, June 9, southwest of Oahu. 
