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magnification. In order to observe a large viewfield, set 0.4X low-magnification
objective to the whorl (at the downside of objective) and then renew focusing .
Fig.4
To order to keep both left and right objective at the same magnification, the
operator must make focusing by the following methods : separately place the
magnification reticles(30) on two table plates, and view them through eyepieces until
two reticles’ scale can completely coincide . If the left and right scales are not
matched , turn the magnification correcting knob until the reticles’ images are
sharp , and then move the reticles to keep two reticles’ scales completely coincide.
Repeat several operations , you may make sure that both left and right objective are at
the same magnification . When change the objective’s magnification, make some
adjustment according to the above methods.
6.Bullet holder : shown as Fig.5
To observe breech-face markings To observe bullet profile
To observe the bottom of cartridge To observe cutting trace
