A list of the Sper­ry Rep­re­sen­ta­tives is giv­en on the tit­le page of this book.

Work­man­ship

The Sper­ry Gy­ro-Com­pass is an ins­tru­ment of pre­cision. From the work done by the Gy­ro-Com­pass and the ob­jects ac­comp­lished it would be natural to class it as a sci­en­tif­ic ins­tru­ment. It is, however, more than that for the reason that it has been made strong and sturdy for operation under the most severe conditions at sea. The most expert and skilled workmanship is required to combine strength and precision, such as found in the Gyro-Compass. The Sperry organization prides itself upon having the best workmen that can be obtained for their respective vocations.

The materials used are the very best obtainable. The rigid and inflexible set of purchasing specifications insures receiving the best materials.

A well organized inspection force passes upon all material upon its receipt, and through the various manufacturing stages to the final product.

The Sampan shoots the rapids of Japanese rivers.

Testing

Each Sperry Gyro-Compass is on test for several days. During this time it is put through every devisable test to simulate the conditions under which it will have to operate. Figures 38 and 39 show a compass mounted on a stand which is operated by means of motor driven gears, cams, etc., so as to reproduce the roll, pitch and yaw of a ship at sea. Absolute accuracy of the Master Compass and all repeaters while operating under this condition is required.