File:Diseases of the heart and thoracic aorta (1884) (14598261059).jpg

Identifier: diseasesofheart00bram (find matches)
Title: Diseases of the heart and thoracic aorta
Year: 1884 (1880s)
Authors: Bramwell, Byrom, Sir, 1847-1931
Subjects: Heart Diseases Aortic Diseases Heart Aorta Aorta, Thoracic
Publisher: Edinburgh, Pentland
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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strument resembles that of the sphygmograph,except as regards the bar which carries the knife edge, A,through which the motion is transmitted to the long lever.This bar, B, is made up of two parts, of which one slideswithin the other, and can be fixed by means of a screw, C, inwhatever position is desired. There is also a second knifeedge, D, which can be raised or lowered at pleasure, attachedto the same bar at a greater distance from the axis of thelong lever. By this means the magnifying power of theinstrument, as regards the vertical height of the curve de-scribed, can be varied from ten to about a hundred. Thebrass frame, which in the sphygniograph is rigidly fixed totwo parallel bars of ivory by which it is supported, is freelysuspended in the cardiograph by means of two transverse rodsof steel, E. These are attached by joints, F, which allow bothof vertical and horizontal adjustment, to four vertical rods of Medico-Chhurgical Transactions, vol. Iviii. p. 359.B B B 754 Appendix.
Text Appearing After Image:
Galabiiis Cardiograph. 755 steel, G, each pair of which is inserted into a bar of woodcovered with leather,—by means of these wooden bars theinstrument rests upon the chest. They can be separated to awidth of nearly five inches, and the instrument can be raisedor lowered at pleasure at either end, and in this way it canbe adapted to a chest of any size or shape. In order that vertical adjustments at either end may bepossible independently, the brass frame is not in immediatecontact with both the transverse bars which support it, butat one end it is suspended by an intermediate piece of brass, I,which, when the instrument is in position, is tightened andmade rigid by a screw. The spring which is employed topress upon the centre of impulse is arranged in a mode similarto that adopted in the sphygmograph. The mechanism, how-ever, by which the amount of pressure is finally adjusted is asimpler one than that employed in any one of the variousforms of sphygmograph now generally used. This

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