This chapter discusses history of blood pressure and its measurements. Measurement of arterial pressures started with the study of radial pulse by Charaka around 400 BC, which was copied by Hippocrates around 100 BC in Greece where by then the Samhitas had reached; brought along by the returning army of Alexander, the Great. The Egyptians, the Arabs and the Chinese also had developed their own methods of the crude appreciation of the arterial pulse pressure. The contributions by Reverend Stephen Hales, Poiseuille, Ludwig, Surgeon Faivre, and so are described. These days sensors on the thumb, strain gauges, photocells and even semiconductors seems to have joined the bandwagon for recording blood pressure more accurately; even for continuous monitoring. The ascendency of the systolic over the diastolic pressure for prognosis is now an accepted fact. With the advent of progress in physics and fluid flow dynamics, ideas of blood pressure and its measurement need refining, to say the least. Recent data shows that the flowing blood generates its own energy as it flows in whirls and not in the way one has been taught in the medical school. Angioscopic studies show the whirling very clearly in animals as also in man.