B. n SMITH-CUMMINGS-MEICHNER APPARATUS (cont'd) 



12. Graphic record: 



Scale: to 70, 140, and 420 meters 

 Paper type: Chemically treated 

 Paper dynamic range: About 20 db 



13. Net weight: 500 pounds 



14. Relay rack (19 inches wide) panel space: 96 inches or less 



15. A.C. power consumption: About 200 watts 



16. Evaluation and recommendations: 



a. Equipment has been used for routine surveys 



b. Equipment is capable of either high resolution or moderate 



penetration with the selection of suitable frequencies 



17. References: X-33 



C. SUBBOTTOM DEPTH RECORDER (SDR) 



The Subbottom Depth Recorder was developed by staff members 

 of the Lamont Geological Observatory. 



1. Model: No model number; designed by B. Luskin, A. C. Roberts, 



and W. C. Beckman 



2. Manufacturer: Alpine Geophysical Associates, Norwood, N. J. 



3. Approximate cost new: $18,975 (May 1959), including sparker, 



(electrical spark source), RASS (repeatable acoustic seismic 

 source), and shipment- storage cases. Price does not include 

 accessory recorder. 



4. Maximum -water depth in which operative: 



Empirically determined: About 2,400 feet 

 Estimated: Not known 



5. Maximum penetration of sediment: 



Empirically determined: 1,500 feet 

 Estimated: Greater than 2,000 feet 



D-4 



