76-RH190 Telescopic Transit Square (English Micrometer)

Ships in 4 Weeks

With Built-In Cross Telescope

The 76-RH190 has precision telescope optics mounted on a solid-cast bronze horizontal axle which combine to produce a well-balanced instrument with feather-touch controls. The 76-RH190 is the undisputed "workhorse" of optical alignment, providing tremendous flexibility with substantial time and labor savings.

The versatile Brunson 76-RH190 transit combines the traditional main telescope with a fixed-focus cross telescope mounted in the horizontal axis of the instrument. This second telescope is fixed at infinity focus to make collimation or autocollimation with another instrument or a mirror quick and easy. This capability means that the 76-RH190 can be quickly made perpendicular to an optical reference line. By simply shifting from the main eyepiece to the cross-axis eyepiece, an operator can establish or verify his/her position relative to the basic reference line in seconds. This effectively requires only one technician, where previously two were required.

Patented ball bearing mounts permit accurate sweeping of both horizontal and vertical planes. The 76-RH190 employs a 194-TM coincidence level for precision leveling. The 194-TM has a 360-degree rotating turret to view the magnified bubble image from any position.

Available with English, metric, or no micrometer. Measurements from the optical reference line are taken by using an optical micrometer mounted on the main telescope. The 76-RH190 comes standard with a model 190 optical micrometer. To order the transit with a metric micrometer, see the 76-RH190M. In event that you do not want either micrometer, order model number 76-RH.

The 76-RH190 and 76-RH190M also come with a model 509 light source, a carrying case, set of adjusting pins, instruction booklet, and plastic cover.

The 76-RH190 is classified as National Stock Number (NSN) 6675-01-052-7029.

For additional general information about this instrument, read about our transits.

May Be Used With

160-x Series Coordinate Micrometers
186 Plastic Autoreflection Target
188 Glass Autoreflection Target
190-x Series Optical Micrometers
191 Combination Reticle Projection, Fixed Right Angle Eyepiece Unit (discontinued)
192 Auto-Collimation Unit (discontinued)
193 Right Angle Eyepiece (discontinued)
193-L Right Angle Swivel Eyepiece, Illuminated Adapter
196-1 Combination Projection, Auto-Collimation, Fixed Right Angle Eyepiece Unit

Although the 76-RH190 comes with its own light source, the following light sources will fit on the instrument:

  • 509 Light Source
  • 508 Light Source (discontinued)
  • 504 In-line fiber optic light source (discontinued)
  • 505-110, 505-220 Fiber optic light sources (discontinued)
Bearings Ball type with a runout of 0.000025" or less
Cross-Axis Telescope Length 11"
Cross-Axis Telescope Magnification 45X
Cross-Axis Telescope Field of View 1 degree
Cross-Axis Telescope Image Erect
Cross-Axis Telescope Optics Low reflective, protective coating
Cross-Axis Telescope Effective Aperture 1.25"
Cross-Axis Telescope Reticle Glass, filar/bi-filar pattern (others available)
Cross-Axis Telescope Focusing Range Focus is fixed at infinity
Finish Grey Textured Polyurethane
Main Telescope Effective Aperture 1.34"
Main Telescope Field of View 1 degree
Main Telescope Focusing Range 2″ to infinity
Main Telescope Image Erect
Main Telescope Length 14″ (with 190 micrometer)
Main Telescope Magnification 20X at 2″ from objective; 30X at infinity
Main Telescope Optics Low reflective, protective coating
Main Telescope Reticle Glass, filar/bi-filar pattern (others available)
Weight, Product (Approx.) lb 34
Weight, Product (Approx.) kg 15.4
Weight, Product & Case (Approx.) lb 54
Weight, Product & Case (Approx.) kg 24.5
Weight, Shipping (Approx.) lb 56
Weight, Shipping (Approx.) kg 25.4
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