A new device for 100 per cent humidification of inspired air

A new humidifier for use during mechanical ventilation in endotracheally intubated patients is described and tested. The humidifier is based on a heat-moisture exchanger, which absorbs the expired heat and moisture and releases it into the inspired air. External heat and water are then added at the patient side of the heat-moisture exchanger, so that the inspired gas should reach 100% humidity (44 mg/l) at 37°C. In bench tests using constant and decelerating inspiratory flow and minute volumes of 3–25 l the device gave an absolute humidity of 41–44 mg/l, and it reduced the amount of water consumed in eight mechanically ventilated patients compared with a conventional active humidifier. During a 24-h test period there was no water condensation in the ventilator tubing with the new device.

Payment order for Peter Whitney, 1791 July 4

Handwritten order to John Sale to pay scholarship funds to Peter Whitney for use by his son, signed by John Clarke, David Tilden, and James Morrill.

Large Upper Devonian arthrodires from Iran / Hans-Peter Schultze --

v.23:no.5(1973)

Megapleuron zangerli : a new dipnoan from the Pennsylvanian, Illinois / Hans-Peter Schultze --.

v.33:no.21(1977)

Letter from Peter Thacher to Loammi Baldwin, 1795 May 5

One-page brief handwritten letter requesting Baldwin appear in Cambridge in his capacity as a member of the committee for examining the senior and junior classes.