Foif J2-2, Инструкция по эксплуатации

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the effect of inclination of standing axis on the circle reading is eliminated. The press
button on the left standard checks the functioning of the automatic index. On
pressing the button, the graduation lines swing away from each other and then
settle back smoothly to their original position. The observer is then certain that the
automatic index is functioning. If the graduation lines do not settle smoothly to their
original position, but jerk to a stop, the instrument is not leveled up correctly.
Method of Operation
This instrument can be used with a three-groove tribrach
1. Centring
1.1 Centring with the plumb bob
Extend tripod legs so that instrument will be at comfortable height. Push bayonet
plug of plumb bob into fixing screw and secure by turning to right. Set up tripod so
that plumb bob is over ground point. Tread tripod shoes firmly into ground.
Open the container. Lift out instrument, place on tripod and with one hand still
holding the instrument, attach by means of tripod fixing screw. Rotate the
footscrews (16) to centre the circle bubble, slacken central fixing screw and move
over tripod plate until plumb bob is exactly over ground mark. Retighten fixing screw.