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  • black-and-white print

    Photographic prints having images composed of a range of tones within one hue, plus the neutral tones.

  • black-and-white transparency

    Transparency having images composed of gray tones, black, and clear areas; may include one hue as a result of process, toning, or discoloration.

  • blackboard

    A board with a smooth usually dark surface for writing on with chalk

  • bladder

    A muscular sac that stores urine, ready for excretion.

  • blank forms

    Forms whose spaces provided for information have not been filled.

  • blanket support

    A framework of metal strips or other material that forms a cage over an injured part of the body of a patient lying in bed, to protect it from the pressure of the bedclothes.

  • blast pipe

    The exhaust steam pipe running from the valve chests into the smokebox box ending directly below the chimney.

  • blast pipe jimmy

    An illegal implement used by steam locomotive drivers, fitted across the blast pipe to increase combustion by splitting the blast and causing a greater draw on the smokebox gases.

  • bleeding bowl

    A shallow bowl four to six inches in diameter, with one flat handle which is usually flush with the rim. Used by barber-surgeons in the 1600s and 1700s when bleeding a patient.

  • blindness

    The inability to see light.

  • blistering

    The process in which the body forms blisters. When the top layer of skin is damaged a blister, a small sac of liquid, forms to protect the soft tissue underneath.

  • block bell

    An electrically powered system of audible communication between signal boxes.

  • blood (animal material)

    Fluid that circulates in the principal vascular system of vertebrate animals. W.

  • blood clotting

    Where the blood changes within the body from a liquid to a solid state and produces a mass of clotted blood which can restrict blood flow.

  • blood donation

    The donation of blood for the purposes of transfusion or testing.

  • blood glucose meter

    A machine that tests the level of glucose in the blood. Blood is deposited on a special strip which is then inserted into the machine to give a reading.

  • blood letting

    To puncture a vein for the purpose of withdrawing blood. A tremendously popular medical practice for over 2000 years. Blood letting can involve withdrawing large quantities of blood in the belief that this would cure or prevent many illnesses and diseases. The practice has been abandoned for all except a few very specific conditions.

  • blood letting needle

    Needle used in Oriential Medicine for the process of blood letting

  • blood poisoning

    The damage caused from absorbing harmful bacteria and toxins from the bloodstream.

  • blood pressure

    The pressure at which blood is pumped around the body, closely related to the heart rate.

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