The Dhow is the trading ship of East Africa.Figure 14.A single gyro-wheel would constitute a satisfactory stationary, or “land compass.” On shipboard the roll, yaw and pitch of the ship would impose additional duty on a single wheel. It would have to point not only True North, but also offset the effect of the sea. One of the two wheels is arranged to always point True North, while its twin wheel opposes and neutralizes all influences other than the force of the earth’s rotation. The force of both wheels is utilized in seeking the meridian.The Master Gyro-Compass is a marvel of mechanical perfection and ruggedness. Every rotating or revolving part moves upon special bearings to reduce friction. It should be noted also that the gyro-wheels do not directly operate the compass card. The compass card is turned by a small electric motor (Azimuth Motor), Figure 17. The slightest change in position between the wheels and card operates the “trolley” or electrical contact, which controls the Azimuth Motor. The card is made to “shadow” the wheels. The follow-up is so close that the card frame has been called the “phantom.”An electrical transmitter, Figure 17, is operated by the movement of the card. This transmitter is the means by which the repeaters are kept in unison with the movements of the Master Gyro-Compass, and made to show the exact reading at any instant. Again the Azimuth Motor furnishes the very slight amount of power required to operate this device.Figure 13.The Master Compass is placed near the center of the ship at the water line. At this point the effect of rolling is at a minimum. It is, however, not necessary to place it exactly at this position. Figure 13 shows the approximate location of the various pieces of equipment aboard ship.
The Dhow is the trading ship of East Africa.
The Dhow is the trading ship of East Africa.
Figure 14.
Figure 14.
A single gyro-wheel would constitute a satisfactory stationary, or “land compass.” On shipboard the roll, yaw and pitch of the ship would impose additional duty on a single wheel. It would have to point not only True North, but also offset the effect of the sea. One of the two wheels is arranged to always point True North, while its twin wheel opposes and neutralizes all influences other than the force of the earth’s rotation. The force of both wheels is utilized in seeking the meridian.The Master Gyro-Compass is a marvel of mechanical perfection and ruggedness. Every rotating or revolving part moves upon special bearings to reduce friction. It should be noted also that the gyro-wheels do not directly operate the compass card. The compass card is turned by a small electric motor (Azimuth Motor), Figure 17. The slightest change in position between the wheels and card operates the “trolley” or electrical contact, which controls the Azimuth Motor. The card is made to “shadow” the wheels. The follow-up is so close that the card frame has been called the “phantom.”An electrical transmitter, Figure 17, is operated by the movement of the card. This transmitter is the means by which the repeaters are kept in unison with the movements of the Master Gyro-Compass, and made to show the exact reading at any instant. Again the Azimuth Motor furnishes the very slight amount of power required to operate this device.Figure 13.The Master Compass is placed near the center of the ship at the water line. At this point the effect of rolling is at a minimum. It is, however, not necessary to place it exactly at this position. Figure 13 shows the approximate location of the various pieces of equipment aboard ship.
A single gyro-wheel would constitute a satisfactory stationary, or “land compass.” On shipboard the roll, yaw and pitch of the ship would impose additional duty on a single wheel. It would have to point not only True North, but also offset the effect of the sea. One of the two wheels is arranged to always point True North, while its twin wheel opposes and neutralizes all influences other than the force of the earth’s rotation. The force of both wheels is utilized in seeking the meridian.
The Master Gyro-Compass is a marvel of mechanical perfection and ruggedness. Every rotating or revolving part moves upon special bearings to reduce friction. It should be noted also that the gyro-wheels do not directly operate the compass card. The compass card is turned by a small electric motor (Azimuth Motor), Figure 17. The slightest change in position between the wheels and card operates the “trolley” or electrical contact, which controls the Azimuth Motor. The card is made to “shadow” the wheels. The follow-up is so close that the card frame has been called the “phantom.”
An electrical transmitter, Figure 17, is operated by the movement of the card. This transmitter is the means by which the repeaters are kept in unison with the movements of the Master Gyro-Compass, and made to show the exact reading at any instant. Again the Azimuth Motor furnishes the very slight amount of power required to operate this device.
Figure 13.
Figure 13.
The Master Compass is placed near the center of the ship at the water line. At this point the effect of rolling is at a minimum. It is, however, not necessary to place it exactly at this position. Figure 13 shows the approximate location of the various pieces of equipment aboard ship.