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  Bausch & Lomb Stereozoom 5 Microscopes

  Natalie E. Owens

  The Bausch & Lomb StereoZoom 5 Microscope was manufactured around 1976. This microscope is intended for use with three-dimensional objects rather than traditional laboratory slides. StereoZoom 5 models have magnification from 0.8x – 4.0x and can be used to study a variety of organic and inorganic materials. A lamp is paired with the microscope as a source of illumination. The two eyepieces on the microscope can be moved closer together or farther apart. A dial on the top of the apparatus is used to adjust the zoom level of the scope. This affects the depth at which the lens focuses. Two knobs on the sides of the supporting rod are used for lowering and raising the scope attachment. A knob at the bottom of the base rotates a mirror which is used to reflect light onto the subject.

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  W.M. Welch Scientific Company Grating Spectrometer

  Natalie E. Owens

  The W.M. Welch Scientific Company grating spectrometer, No. 3693, was manufactured around the 1950s. A light source can be placed at the slit near the wider end, by which it will illuminate a graduation scale, measured in angstroms, inside of the device. The width of the slit can be adjusted using the silver knob attached to the back of the spectrometer. A small reading light can be attached to the clamp between the scale and the slit for the purpose of making the scale easier to view. When looking through the scope, you will see the first-order spectrum of the light source appear on a marked scale to the right, allowing you to view the distance between the fringes.

  The spectrometer can be calibrated using a known light source, such as helium. Place a helium light source in front of the slit on the back of the spectrometer. Look through the scope. You should see a yellow fringe between the 58 and 59 angstrom line. The slit may need to be adjusted in width depending on the strength of the light source. If the yellow fringe is not in this position, then the eye piece of the scope may need to be adjusted. Consult the digitized manual for instructions on this process.