To record echoes.specially treated paper was driven by a gear mechanism and marked with a stylus. This paper was impregnated with a solution of potassium iodide and starch. Passage of electrical current through the paper from stylus to roller released 'free' iodine. The iodine was then deposited on the paper thus making a record in the form of a brown mark. When installing fresh paper records, it was imperative to minimize the amount of time that the paper was exposed to air. Within the recorder, the paper roll was stored in an airtight container known as a tank. Each roll of paper was 30 yards long and a black warning mark would appear on the right hand edge signifying the approach of the end of the roll. After its appearance, there was still sufficient paper remaining to complete the attack. Alternately, yellow coloured, cadmium-iodide paper could be used in the range recorder. Generally speaking, the range recorder was only switched on when investigating a contact and during attack.

The recorder also had a paper speed switch which had two positions. - Cruising and Attacking. In Cruising , the paper moved slowly, just fast enough to give a clear space for the stylus to mark on. In Attacking mode,  the paper moved at a faster speed. The object of the switch was to save paper by providing a slow paper speed when sweeping. When sweeping was initiated, the range recorder operator had to see that the paper speed switch was set to cruising. On gaining contact, the switch was set to Attacking .

To summarize, the range recorder has two jobs. One is to make the transducer train and transmit when it should. The other is to mark the echoes on the paper and indicate the time to fire the A/S weapon. The recorder is fitted with control switches. They are the barrel switch with four positions, the scale change switch and the paper speed switch. It also has a handle to adjust the transmission interval.

When deployed, the sword could project a fan shaped beam being narrow in the vertical plane and wide in the horizontal plane. It could be trained up to 65 degrees horizontally and 45 degrees vertically .This new design, which added depth determining capability, could accurately track a target within 20 feet. Another feature was its integration with Squid, an ahead-throwing Anti-Submarine (A/S) mortar. But Squid was not fitted to HAIDA until her 1949 - 1952 modernization. 

When an echo was received on a 147B set, the operator would tilt the sword until the echo was lost. He would then reverse the procedure until the echo was heard again, then continue sweeping until the echo was lost on the opposite end of the sweep. Every echo received would then be printed on the depth recorder. A line of light on the depth recorder would indicate the centre of the echo trace. The operator would then look at a calibrated scale and read off the depth directly in feet. From here, the information was used for setting the pistols on depth charge fuzes. 

In 1942, the minimum range for a lost contact was around 170 yards, As U-boats went deeper when attacked, the minimum range was about 270 yards in 1945.

There were three, fixed, quartz transducers mounted in the forward end of the ship's hull. One unit faced port and another faced starboard. The third unit, mounted in the keel, faced straight down. In operation, either the port and keel or the starboard and keel transducers were used. They produced a sound beam at right angles to the ship's fore and aft line. This beam was fan shaped, being narrow in the horizontal and very wide in the vertical plane. A simple changeover switch provided a means of projecting the beam to port or to starboard.

The recorder produced a shadow trace that gave a reasonably clear picture of the bottomed object. By application of a mathematical formula, it was possible to determine the length and width of the target. The transducers were mounted in hull fittings that were secured on the inside of the ship's hull. 

Another system equalized the pressure inside the fittings to that of outside sea water. This was accomplished with inter-connecting pipes between the hull mountings and a supply tank that was mounted inside the ship at water level. The liquid used in this system consisted of a mixture of water and glycerine. This prevented freezing and possible damage to the hull mountings in colder climates.

Otherwise known as "Tracer" (RCN) or "Sounder" (RN),   SQS-502 was functionally equivalent to  type 162 sonar. 

This device was an underwater communication set, or as it was more commonly referred to as an Underwater Telephone. It was designed for use in  submarines and surface ships to provide amplitude modulated (AM) voice or CW (Morse code) communication through the water using a 8.0875 kHz carrier. 

The AM mode employed Single Side Band (SSB) using the upper side band (USB). The useable range varied between  8,000 to 12,000 yards depending on ship's speed and sonar conditions. That is the range quoted for the 'A'  and 'B' variants.  Morse code used a fixed audio note of 712 Hz. Personnel stationed on the ship's bridge used a telephone like device when communicating on voice.

A small, cylindrical, magnetostriction transducer was fitted in the sonar dome, aft of the main set. A combined receiver-transmitter panel was fitted in the Sonar Equipment compartment while the 'sonar set  remote control unit (SSC-RCU) was mounted at either the command position on the bridge or in the operations room. The SSC- RCU contained a power off/on switch for the set, a loudspeaker with volume control, a Morse key, a phone/CW switch and a microphone. The UQC-1B gear was housed in the Sonar Equipment compartment which is on the forward mess deck. The transducer for the UQC-1B was located in the sonar dome. 

A hand written note on one of the source documents for this device indicates that the RCN ordered 45 sets on the initial procurement.  HMCS Haida was fitted with the AN/UQC-1B at the time she was paid off.

The in-service date for the fitting of UQC-1B in HAIDA is a bit uncertain. Here are the production dates for the variants.

UQC-1A - March 1958
UQC-1B - 1960
UQC-!D -  1962
A Parts Manual for the UQC-1B is dated 1956. Unless some collaborating data arrives, post 1960 will be used as the in-service date for the UQC-1B aboard HAIDA. 
 

SONAR could not be used if the ship was travelling over 15 knots because the water flowing over the Hull Outfit would produce noise and mask the echoes.. (Photo by Jerry Proc)

When the dome was in the  up position there was a seal that allowed the inside cover of the dome to be removed without the ship filling full of water. That was one way of exchanging a bad transducer. 

1) Dome locator. It has  three indicator lights: up--moving--down.
2) Gyro repeater.
3) 164B Bearing Recorder. It also sent a signal to a readout in the wheel house. When the bridge gave the order "steer by sonar", the helmsman would follow the sonar bearing  repeater.
4) A/P 9960  Control Trainer. By turning the knob to a new bearing,  the transducer will follow to the new bearing. By pressing the knob, the sonar set transmits a single pulse. This is also known as the Captain's Bearing Instrument. 
5) 164B Range Recorder.
6) 164B Down Angle Recorder. 
7) Barometer. It does not belong in the SCR and was placed there only to cover up a bunch of cut cable ends. 

Three, small, circular gauges mounted to the plywood bulkhead do not belong there. These are pressure gauges and were  mounted for a movie shoot. They have never been taken down.

The AN/SQS-10 operator's console would have been at the aft bulkhead of the Sonar Control Room. It was removed from the ship by the Navy when HAIDA paid off.  There was also a repeater for it above the VK5 PPI in the Operations Room. 

Out  of view is the AN/SQS-501 recorder which was mounted on the starboard bulkhead in the Operations Room.