SURFACE SHIP AND SUBMARINE GRAVITY METER FOR SURVEY USE 
Sketchs 
(To be provided) 
Primary Use: 
This is a precision instrument designed for survey use. It will 
permit the continuous measurement of gravity profiles from surface 
ships and submarines. 
Specifications and Requirements: 
ae This is primarily an underway instrument and should perform with 
accuracy and reliability for ship's speeds between O and 15 knots. 
b. It should also perform effectively in sea states O through 5 and 
under the influence of long-period swells. 
ce It must be capable of measuring over an overall range of 7,000 
milligals without resetting; this range to cover 977 to 984 gals. 
d. Individual readings must be accurate to +2 milligals over the 
entire operating range. 
e. It must have a zero or a constant drift rate (not to exceed 
5 milligals) over periods of at least one month, and have automatic 
input of corrections to readout. 
f. It must be rugged, easy to maintain, and of such size and weight 
as to permit installation aboard surface ships and submarines. 
ge It must be capable of making automatic corrections for horizontal 
accelerations, and must not be adversely affected by the average horizon- 
tal or vertical accelerations of the vessel. 
h. It must eliminate secondary vertical effects. 
i. Its readout must be compatible with Master Shipboard Data Logging 
and Processing System inputs, where navigational and other related data 
can be added to gravity data. 
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