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Join this channel to get access to perks: Want to learn more about Periscope Film and get access to exclusive swag? Join us on Patreon. Visit Visit our website This historic film about the compound microscope was produced in 1953 by Bausch and Lomb, one of the oldest operating companies in the USA, which held many patents for microscopes and binoculars and was an international supplier of great renown. Today it is best known as a eye health products company. A compound microscope is a microscope that uses multiple lenses to collect the light from the sample and then a separate set of lenses to focus that light for the viewer. It is heavier, larger, and costlier than a simple microscope, but it improves numerical aperture, reduced chromatic aberration, and offers adjustable magnification through interchangeable objective lenses. Note: The film appears to focus on a KAJ Binocular Stereomicroscope, or a related model. Title sequence: Bausch & Lomb Optical Company: “The Compound Microscope”, Stanford L. Sobel, Carl Brose, Henry C. Wayne. Sturgis-Grant Productions, New York (0:07). Compound microscope on display table (0:30). Microscope with binocular body against plain background; conversion, monocular to binocular use (0:45). Simple compound microscope for student use (1:10). Various compound microscope models (1:20). Microscope spinning on display again (1:45). Diagram: path of light through microscope (2:00). Diagram: human vision—object, eye, lens, retina, light rays, image (2:10). Diagrams: compound microscope lens’ effect on vision—eyepiece, objective lens, stage, specimen, primary image, virtual image (2:44). Base of microscope demonstrated with fine adjustment controls (4:30). Base of microscope set alongside diagram of compound microscope parts (4:50). Arm of microscope demonstrated—pivoting joint of compound microscope, attached piece (5:00). Stage of microscope demonstrated with holes on side, attaching mechanical stage using thumb screws (5:27). Movable microscope stage demonstrated, using racks, pinyons, knobs, movable finger (5:40). Placing specimen slide on microscope stage (6:00). Body tube and rack slide assembly of compound microscope with coarse focusing mechanism (6:23). Revolving nosepiece being attached to body tube of compound microscope (6:45). Microscope objectives with labels—focal length 4 mm, numerical aperture , magnifying power 43x, KD6403 (7:00). Compound microscopy—cross-sections of optical systems, various objectives (7:30). Demonstration—installation of objectives on compound microscope (7:40). Five-power eyepiece and ten-power eyepiece of compound microscope displayed / demonstrated (7:55). Condenser on compound microscope displayed—Abbe condenser, various lens elements (8:28), variable focus condenser (8:50). Presenter (man in lab) highlights benefits of variable focus condenser using fluorescent glass sample (changing angle of light, microscopy) (9:19). Diagram of compound microscope objective and condenser, light rays (high and low NA) (10:05). Close-up of compound microscope in use, plain background (10:20). Variable focus condenser diagram, installation demonstrated (10:45). Person handles mirror of compound microscope (11:15). Tuning fork bracket of compound microscope (11:20). Curved mirror of compound microscope (11:30). Microscope part installation (11:55). Light with adjustable diaphragm, color filters (illumination, microscopy) (12:12). Sub-stage illuminator in use (12:37), simple illuminator in use (13:13). Person places specimen slide on stage of microscope, uses microscope (coarse adjustment, approximate focus, critical focus, split screen to show resulting image, turn to change to high power objective, parfocal objective lens) (13:25). Fields of view of microscope, varying focus at edge vs. center; microscopic images (15:09). Resolving image —person removes eye piece, uses neutral density filter (ground glass), looks through tube at objective, adjusts sub-stage diaphragm and condenser (split screen) (focal length, NA), replaces eyepiece (15:49). Image of specimen before and after adjustments (16:45). Adjusting light intensity using illuminator filters (17:15). Diagram of microscopy — high objective (17:25). Diagram of oil immersion (17:50). Man operates microscope, applies oil to slide, changes objectives, cleans oil from microscope (18:00). Focus changing on image under microscope (19:22). Man cleans microscope and various parts, microscope covered with protective bag (20:13). Microscope in use (21:54). The End (22:10). This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit
