. Journal. mination oihigh temperatures. Between a nut z and a tube A (Fig.•J), infusible rings, and such fusible at known temperaturesof .mini, height (a and f), are alternately inserted in such?a manner as to stretch a spring s, w bich i-* in connectionwith a transmitting arrangement, By means of the nuta. the finger is fixed at the zero-mark. If now f. i. ringsbe Used, which fuse at 200 , 400°, and 000°, the rod , 1() and loniin. as soon as a temperature has heenreached at which the rings fuse. The contrivance, there-fore, only shows the highest temperature. Guichard and Co. describe, in th
. Journal. mination oihigh temperatures. Between a nut z and a tube A (Fig.•J), infusible rings, and such fusible at known temperaturesof .mini, height (a and f), are alternately inserted in such?a manner as to stretch a spring s, w bich i-* in connectionwith a transmitting arrangement, By means of the nuta. the finger is fixed at the zero-mark. If now f. i. ringsbe Used, which fuse at 200 , 400°, and 000°, the rod , 1() and loniin. as soon as a temperature has heenreached at which the rings fuse. The contrivance, there-fore, only shows the highest temperature. Guichard and Co. describe, in the Revue industrielle,1884, p. 161, a finger-motion lor metal-thermometers bymeans of a spring made of several metals. Such pyro-metei a are know n to very unreliable. A. and E. Boulier,of Paris, have improved their waterpyrometer. The water which absorbs heat from thespace whose temperature is to he measured, say a furnaceHue, runs through the tap H (Fig. ,i) into the pipe R,. which is placed in the Hue. From here it returns throughpipe >? into the receptacle N, where its heat is measuredby a thermometer. It then travels through the tap tothe cup K, which is fastened to a beam, and held inequilibrium by a sliding weight T. A pliable rod p isfixed to the fulcrum of the beam in such a manner thatit can first come into contact with the pin (I, and thenwith 1, as soon as the beam K swings owing to a decreaseof weight at K. If, in consequence of an obstacle in thepipes, or owing to any circumstance the quantity of waterentering K decreases, pand < . come into contact, wherebyan electrical alarum hell I, is set in motion. If the waterfurther decreases, p also touches tlu pin 1, which causes the weight .1 to shut oft the water at II. The pine R,and all others conducting water from the line to \, arecovered with a non-conducting substance in order to avoidloss of beat. R. Iluess, of Berlin (Germ. Pat. No. 26,606, 1883), haspatented a maximum ami m
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
