RETRIEVING LINE 



3' DIAM. DAMPING DISK 



2S~ 

 15 LB. WEIGHT 



Figure 10-1. Overboard assembly of the electric wave 

 staff. 



60 cycles, AC; power consumption is about 75 

 watts. The assembly must be mounted in an 

 area secure from spray or rain, yet accessible 

 to the working area where the wave staff is 

 assembled and tended when over the side. 

 The recorder should be mounted off the deck 

 at a height where it is easily readable. Good 

 communication between the recorder operator 

 and those tending the wave staff on deck is 

 essential. 



10-17 Accessories and Spare Parts. — Ac- 

 cessories and spare parts, such as recorder 

 pens, recorder ink, chart paper, damping disk 

 suspension line, balancing weights, wax, 

 shackles, waterproof tape, waterproof sealer, 

 snaphooks for floats, and grease are included in 

 a spare parts kit, which accompanies the wave 

 staff. In addition, seven floats, or life rings, are 

 supplied to provide suspension for the electrical 

 cable. A 1,000-foot length of cotton sash 

 cord, or heaving line, is also provided for use as 

 a retrieving line. 



10-18 Assembling the Electric Wave Staff 

 for Operation. — Assembling the wave staff and 

 preparing for lowering is carried out as follows: 



1. Lay out on deck the three sections of the 

 wave staff, the damping disk, weights, sus- 



pension line, electrical cable, floats, and re- 

 trieving line. 



2. Check the contacts on the step-resistance 

 gage to see that they are clean and bright. If 

 necessary, burnish the contacts lightly with 

 fine emery cloth to produce a bright surface. 

 Rub down the gage section with a clean dry 

 cloth and apply the wa.x provided and wipe 

 off as needed to produce a water-repellent 

 surface, avoiding the contact points. Grease the 

 end fittings of all three sections. 



3. Assemble the 3 sections of the staff as 

 shown in figure 10-1. 



4. Secure the damping disk to the bolt at 

 the lower end of the wave staff by means of 

 the suspension line and shackles provided, so 

 that the face of the damping disk is 20 feet 

 from the lower end of the staff. 



5. Shackle the 15-pound weight to the eye 

 on the underside of the damping disk. 



Note. — Sufficient weight should be used to float 

 the assembly with about 6 feet of the step-resistance 

 gage exposed in calm water. On some staffs only a 

 10-pound weight is required. 



6. Plug in the electrical cable connector (Joy 

 plug) to the upper end of the step-resistance 

 gage. Tape the connection lightly to insure 

 a watertight seal. Next, tape the electrical 

 cable along the rear of the three sections of the 

 staff and put it through the shackle which 

 secures the damping disk suspension line to 

 the eye on the bottom bolt. 



7. Make fast the end of the 1,000 feet of 

 cotton retrieving line to the eye on the edge 

 of the damping disk. 



8. Secure two 30- to 40-foot long handling 

 lines to the staff just above the two joints. 



9. Fasten the floats to the electrical cable. 

 The first should be 75 feet from the bottom of 

 the wave staff, the others about 100 feet apart. 



10. Set the gage on the deck with the con- 

 tact points upright and clear of all metal 

 objects. 



10-19 Calibrating and Testing the Electric 

 Wave Staff. — Before the wave staff can be 

 lowered over the side for operation, the gage 

 and recorder must be calibrated and tested. 

 This must be done before each lowering. The 

 procedure is carried out in the following manner. 



1. Test the pen of the recorder for proper 

 inking and pen pressure. Instructions for this 

 are given in the Brush Recorder Operating 

 Instruction Manual along with other informa- 

 tion concerning maintenance of the recorder. 

 A copy of this manual is included in the spare 

 parts box. 



2. Connect the electrical cable from the 

 wave staff to the connector at the back of the 



H. O. 607 



105 



