Scientific apparatus and instruments
<p>Bausch &amp; Lomb Abbe Refractometer Serial No. 380
1919 - 1926
</p><p>A: Refractometer (right)
Instrument has round cast iron base; on the base is a rectangular glass mirror mounted to allow rotation; a single black pillar supports the prism alidade, the black cylindrical telescope viewer, and another viewer/magnifier above the scale; scale and telescope are in fixed position; scale-reading telescope can be moved on a pivot that also moves the prism alidade; knob at base of telescope turns to control dispersion; prism apparatus can be opened and closed using a locking mechanism.
</p><p>B: Box/Carrying Case (left)
</p>
Rectangular hardwood case; brass key is in lock and operates locking mechanism; metal carrying handle on top; inside of box door has several wooden attachments for instrument accessories; inside of box has wooden attachments for securing refractometer.
<div class="fn value">
Staff photographer</div>
2017
<a rel="nofollow" class="external free" href="https://digital.sciencehistory.org/concern/generic_works/m039k545g">https://digital.sciencehistory.org/concern/generic_works/m039k545g</a>