10-22 Recording the Electric Wave Staff 

 Data. — After the last wave trace of a run, a line 

 must be drawn across the chart paper to sepa- 

 rate that run from subsequent ones. All print- 

 ing should be done with the curved lines of the 

 chart paper bowed to the right. The following 

 information should be printed in ink on the 

 recorder chart paper to the right of the drawn 

 line and to the left of the last wave trace (fig. 

 10-2) : 



1. Ship, cruise, and visual wave observation 

 serial number followed by W for example, 

 RE-15-34W. This number should also be re- 

 corded in the Remarks column of the Shipboard 

 Wave Observation Log (PRNC-xNHO-1192) on 

 the same Hne as the visual observation taken 

 during the wave-staff run. 



2. Date. Give the day, month, and year. 



3. Time. Use Greenwich mean time (GMT). 

 Record the hour and minute at the beginning 

 of the run and again at the end of the run. It 

 is helpful during the run to mark numerically 

 each minute signal made by the recorder on the 

 chart paper: 1, 2, 3, 4, 5, 6, 7, etc. 



4. Position. Give the latitude and longitude 

 of the observation. 



5. Record the wind speed in knots and direc- 

 tion in degrees true. 



6. If known, give the current speed in knots 

 and direction in degrees true. 



7. Give the apparent direction of wave 

 motion in degrees true. 



8. Record the voltage used throughout the 

 run as shown on the variac during the calibra- 

 tion. 



9. Record the electric wave staff serial 

 number. 



10-23 Storing and Shipping of Electric 

 Wave Staff Records. — The used chart paper 

 should be kept continuous, if possible, until 

 the roll is completed and shipped along with 



the associated shipboard wave observation 

 log sheets to: 



Hydrographer 



U. S. Navy Hydrographic Office 



Washington 25, D. C 



Attn: Code 5430 

 10-24 The Wave-Staff Electrical Circuit.— 

 The shipboard electrical circuit is shown 

 schematically in figure 10-3. The step-re- 

 sistance gage wiring is shown in figure 10-4. 

 The design values of resistance in the gage 

 section are as follows: 



Oft 7715 



Top 1000 (above top contact) 



65 



67 



72 



75 



80 



85 



90 



96 

 103 

 117 

 126 

 136 

 147 

 159 

 173 

 189 

 206 



Okmi 



226 



252 



279 



313 



351 



398 



456 



526 



615 



726 



873 



1068 



1338 



1723 



2304 



3200 



4920 



Bottom 8210 



10-25 Summary of Important Operating 

 Instructions. — To insure proper operation of 

 the electric wave staff, always be sure that: 



1. The step-resistance gage is clean and 

 water repellent. 



2. The contact points are clean. 



3. The cable is kept slack during operation. 



4. The cable connection to the step-resistance 

 gage is waterproof. 



5. The recording pen is properly set for zero 

 and full-scale deflection. 



Figure 10- 



Wave record obtained with electric wave staff. 



H. O. 607 



107 



