Fig 1 1.23 Photomosaic of a 4th century Roman shipwreck taken by ASHERAH (Univ, Penna) 



1 — Television camera (Hydro Products 

 TC0303) mounted between the 20-mm 

 cameras 



1— TV monitor (Sony PVT 304R U) in 

 pressure hull 



1 — Tilt sensor (General Precision C70 

 9560) to obtain vehicle's pitch and roll 

 with each camera exposure 



1 — Isobaric altimeter (differential pres- 

 sure gage) to define a horizontal plane 

 parallel to mean sea level and assist 

 the pilot in maintaining constant 

 above-the-bottom altitude 



1— Bendix Fathometer (200-kHz) to indi- 

 cate distance-to-bottom 



1 — Magnesyn compass to provide azimuth 

 direction 



1 — Photographic recorder (Nikon F) to ob- 

 tain a permanent record of tilt, altime- 

 ter reading and camera frame number. 

 The cameras were adjusted to expose at a 

 preselected interval in concert with the 

 strobes. Proceeding at a predetermined com- 

 pass course the pilot attempted to maintain 

 a distance of 15 to 20 feet off the bottom 

 using the Fathometer and the altimeter for 

 guidance. With each exposure of the 70-mm 

 camera there was a synoptic exposure of the 

 35-mm camera to record the vehicle's atti- 

 tude for subsequent photographic analysis. 

 Similar results were obtained by Pollio (9) 

 using STAR III and 35-mm cameras. The 

 choice of 35-mm versus 70-mm format is in- 

 fluenced by trade-offs. A 70-mm film provides 



572 



