This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.

This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.

This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.

This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.

This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.

This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.

This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.

This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.

This is an early form of electrocardiograph (ECG) machine. ECGs are graphical records of the activity in a person’s heart. These graphs are produced via an instrument called a galvanometer. In this example, the galvanometer is seen in the centre. Electrodes placed upon the body pick up on minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. Physicians examine these records for irregularities that may be a sign of disease. A plate camera can be seen in the rectangular box at the end. This electrocardiograph machine was made by French company Boulitte.