| 摘要 |
An accessory for aligning items parallel to the measurement axis of an outside micrometer, comprising:a platform, having a flat surface bisected by a depressed channel, the platform including a first cylindrical ring disposed at one end of the channel, the platform also including a keyed cavity beneath the channel,a second cylindrical ring, connected to a keyed rod, the rod being slidably installed into the keyed cavity, whereby the first and second cylindrical rings are maintained coaxial and parallel to the platform surface and the keyed channel,a spring, retained in the keyed cavity by the keyed rod, exerting outward force on the rod and attached ring, maintaining them in a slidably extended position, limited by protruding wedges in the keyed cavity.
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