Note 129 — OF THE Means of Preserving the Health of Soldiers on Service.
Reading edition
This Ventilator is no more than a long Tube, with a Tin Box, about six Inches wide and four high, with a Number of Holes at the Top, fixed at one End; and this Box is put down to the Bottom of the Water, and the Nose of a Pair of Bellows fixed to the other End of the Tube, which is above the Water; by working the Bellows, fresh Air is driven through the whole Body of Water, the putrid Effluvia are evaporated and dispersed, and the Water becomes sweet in a very short Time.