An underwater telephone transducer was used as a sound source to study the re- 

 sponse of animals to a particular frequency band. Visual observations at great depths 

 were supplemented by photographs taken with a special camera and flash designed 

 and built by Dr. H. E. Edgerton. The camera and flash were located 5 meters from 

 the sphere near the bow where it could photograph objects illuminated by the far mer- 

 cury lamp. Features near the sphere could be effectively photographed using other 

 cameras inside the sphere. The Edgerton camera was capable of taking 800 35-millimeter 

 exposures at a rate of one every 5 seconds. As an adjunct to these observations, a re- 

 motely controlled plankton sampler was installed on the bathyscaph's deck. This was 

 capable of collecting and retaining twenty separate samples and was controlled from 

 within the sphere. An electronic temperature-sensitive unit was installed for the diving 

 program. 



TABLE 1. Summary of dives made by the bathyscaph during 1957. 



Longitude 



Depth Depth 



(meters) (ft) 



Purpose 



23 



Costellammore 







34 



112 



Kielhorn 



5- 



Technical 



24 



Capri 



40°24'50N 



14°16'05E 



260 



853 



Jerlov 



7- 



1 



Light penetration 



25 



Capri 



40''26'00 



14°15'15 



310 



1017 



Jerlov 



7 



1 



Light penetration 



26 



Capri 



40°30'00 



14°15'00 



600 



1968 



Jerlov 



7 



3 



Light penetration 



27 



Capri 



40°30'00 



14°15'00 



1080 



3543 



Dietz 



7 



3 



Oceanography 



28 



Capri 



40°30'00 



14°15'00 



1100 



3510 



Lewis 



7 



18 



Acoustics 



29 



Capri 



40°30'00 



14°15'00 



1125 



3691 



Rechnitzer 



7 



20 



Oceanog. & biol. 



30 



Capri 



40°30'00 



14°15'00 



1080 



3543 



Lomosk 



7 



25 



Acoustics 



31 



Capri 



40°3r56 



14°13'55 



178 



584 



Madison 



7 



26 



Demonstration 



32 



Capri 



40°31'56 



14°13'48 



300 



984 



Kobr 



7 



26 



Biol. 



33 



Capri 



40°31'43 



14°14'12 



470 



1542 



Rechnitzer 



7 



26 



Oceanog. & biol. 



34 



Castellammore 



40''42'00 



14°27'50 



53 



174 



Maxwell 



8 



30 



Technical 



35 



Capri 



40°30'55 



14°27'45 



1090 



3576 



Lewis 



9 



2 



Acoustics 



36 



Ponza 



40°35'00 



13°00'00 



2800 



9189 



Lewis 



9 



9 



Acoustics 



37 



Ponza 



40°35'00 



13°00'00 



310 



1017 



Lewis 



9 



11 



Acoustics 



38 



Ponza 



40°35'00 



12°55'00 



3200 



10,500 



Lomask 



9 



20 



Acoustics 



39 



Ponza 



40°30'00 



13°00'00 



3000 



9843 



Frossetto 



9 



21 



Acoustics 



40 



Capri 



40°3roo 



14°15'00 



1090 



3576 



Rechnitzer 



10 



12 



Oceanog. & biol. 



41 



Capri 



40°30'36 



14°14'21 



1035 



3396 



Botteron 



10 



14 



Geol. 



42 



Capri 



40°30'18 



14°13'54 



1080 



3543 



Frossetto 



10 



14 



Acoustics 



43 



Sorrento Pen. 



40°33'35 



14°21'24 



820 



2690 



Diceglie 



10 



16 



Gravity 



44 



Capri 



40°33'30 



14°14'20 



24 



79 



None 



10 



17 



Photography 



45 



Capri 



40°33'50 



13°59'30 



220 



722 



Salvi 



10 



18 



Demonstration 



46 



Capri 



40°33'50 



13''59'30 



270 



885 



Stearns 



10 



18 



Demonstration 



47 



Capri 



40°33'50 



13°59'30 



245 



804 



Baume 



10 



-18 



Photography 



48 



Castellammare 



40°41'50 



14°24'15 



92 



302 



Ventura 



10 



25 



Demonstration 



Total dives, 26: 

 Scientific 18 



Technical 

 Demonstration 4 

 For movies 2 



26 



2 (Kielhorn & Maxwell) 



Personnel 

 Participating: 



American 1 

 Italian 

 Swedish 

 Swiss 



Details of Operations: 



Total time under water: 70 hours 

 Total distance traversed: 43.6 kilometers 

 (27.2 miles) 



