re of thisvalve is its ability to maintain auto-matically a uniform low pressure inde-pendent of the varying high pressure. SftltutxiU ^mttxtm. outside covering of heavy rubber, each fold beingstiffened by a piece of whitewood a quarter of aninch thick. It was then lined inside with heavyblack… … AN AUTOMATIC REDUCING VALVE. wood were used. The bellows is divided into foursections, as shown in our engraving, and betweeneach section is a supporting frame mounted onsmall wheels which run on a steel track; the backsupporting the plate-holder is operated as easily asin an ordinary camera. The…
