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The {{Title|General Radio 1521-P10B Drive Unit}} was introduced in {{Catalog S}} and remained available through {{Catalog 1973}}. | The {{Title|General Radio 1521-P10B Drive Unit}} was introduced in {{Catalog S}} and remained available through {{Catalog 1973}}. | ||
The Type 1521-P10B is an accessory for the [[1521-B | The Type 1521-P10B is an accessory for the [[1521-B|1521-B Graphic Level Recorder]] that enables the recorder to drive an external instrument. | ||
It replaces the Type [[1521-A]] drive. The new version encloses the limit switch mechanism. | |||
Two adjustable limit switches are provided, stopping the recorder drive to protect the connected instrument. | |||
Two thumbwheels located at the top of the drive adjust the limits. The drive has three modes of operation – Idle, Slip, and Non-Slip. | |||
==Specifications== | ==Specifications== |