Johnson Level 40-6912 User Manual
7443H-English_Manuals 10/24/13 11:13 AM Page 1
22X Builder’s Transit Level
Model No. 40-6910
Instruction Manual
Congratulations on your choice of this 22X Builder’s Transit Level. We
suggest you read this instruction manual thoroughly before using
the instrument. Save this instruction manual for future use.
©2013 Johnson Level & Tool - Rev. 2 1
7443H-English_Manuals 10/24/13 11:13 AM Page 2
Table of Contents
1. Kit Contents
2. Features and Functions
3. Location of Parts/Components
4. Operating Instructions
5. Calibration
6. Technical Specifications
7. Care and Handling
8. Product Warranty
9. Product Registration
10. Accessories
1. Kit Contents
Description Qty.
22X Builder’s Transit Level 1
Instruction Manual with Warranty Card 1
Hard-Shell Carrying Case 1
2. Features and Functions
• Horizontal Circle - Graduated to single degrees and reads by
vernier direct to 15 minutes
• Vertical Arc - Reads to degrees 45-0-45º
• Horizontal Tangent Screw & Vertical Lock & Tangent Screw For precise movement control.
• Built-in Sunshade - For clear sighting
• Top Mounted Leveling Vial - For effortless viewing
• Large Leveling Screws - Easy to turn
• Versatile - Ideal for leveling foundations, driveways, patios,
floors, for grading street, curbs ditches for aligning fences; or
any other light construction job.
2 ©2013 Johnson Level & Tool - Rev. 2
7443H-English_Manuals 10/24/13 11:13 AM Page 3
3. Location of Part/Components
Focusing knob
Lock Lever
Vertical arc
Vertical vernier
Horizontal vernier
Vertical
tangent knob
Vertical lock knob
Leveling Vial
Eyepiece
Horizontal graduated
circle
Horizontal
tangent knob
Base
©2013 Johnson Level & Tool - Rev. 2 3
Telescope
objective lens
Leveling screw
7443H-English_Manuals 10/24/13 11:13 AM Page 4
4. Operating Instructions
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
Set-Up the instrument on the tripod
When setting up the tripod, make sure the three tripod points are firmly
into the ground and the top of the tripod head is as level as possible.
Adjust the height of the tripod to a comfortable viewing height, and
secure the retractable legs. Attach the instrument to the tripod head
with the center screw and tighten securely as shown in figure below.
Leveling
Mount the instrument on the tripod, lock the
telescope in place with the lock lever and line
up the telescope vial in position #1 as shown.
Then grasp screws A & B so that both thumbs
are moving in opposite directions, either
toward each other or away from each other.
Note that the bubble moves in the same
direction as your left thumb.
4 ©2013 Johnson Level & Tool - Rev. 2
7443H-English_Manuals 10/24/13 11:13 AM Page 5
Keep about half the length engaged. When the bubble is centered in position #1, turn the instrument and observe the vial in position #2. Now center the bubble in position #2 using only screw C. The instrument should
now be leveled, but to be certain, double-check. Rotate the instrument
180º so the vial is reversed. If the bubble will not center when reversed,
follow adjustment procedure outlined under “Bubble Adjustments.”
Aiming and Focusing
Rotate the instrument by hand to aim the telescope to the far object.
Rotate the focusing knob until the object can be observed clearly.
Rotate the horizontal tangent knob, to place the vertical cross hairs
on the object.
Reading the Vernier
The vernier is actually a double
vernier, that is, two verniers in
one. This makes it possible to
read any angle turned by the
telescope, whether to the right
or to the left. For example,
consider that you have turned
an angle to the left (counterclockwise) after first having set the circle to read 0º. Refer to the
bottom figure, this is what your vernier looks like after having turned
the angle.
©2013 Johnson Level & Tool - Rev. 2 5
Loading...