Assertion: sextant | /r/AtLocation | figure
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Source sentences:
text: Plath were still producing vernier instruments in 1920, the date of the sextants shown in Figure 3, but by then was using a fine adjustment system that was on its way to being a micrometer, in that the “endless tangent screw” operated on a fine rack cut into the back of the limb, as shown in Figure 4.