Chemical engineering . Knott Apparatus Company, Boston, Mass. It was designedwith a view of obtaining the highest degree of precision ofwhich the plug form of Wheatstone bridge is capable. Theaccuracy of a resistance box in practical use depends upon anumber of conditions of which the mere accuracy of adjust-ment is but one. In the University of Texas Resistance object was to provide permanency of calibration in everydetail. The coils of this box are:Rheostat arm. 1 ID 100 1000 ohms 2 20 200 2000 3 30 300 3000 •• 4 40 400 4000 •? Ratio arms. I 10 100 1000 10 100 1000 Total. . I 3
Chemical engineering . Knott Apparatus Company, Boston, Mass. It was designedwith a view of obtaining the highest degree of precision ofwhich the plug form of Wheatstone bridge is capable. Theaccuracy of a resistance box in practical use depends upon anumber of conditions of which the mere accuracy of adjust-ment is but one. In the University of Texas Resistance object was to provide permanency of calibration in everydetail. The coils of this box are:Rheostat arm. 1 ID 100 1000 ohms 2 20 200 2000 3 30 300 3000 •• 4 40 400 4000 •? Ratio arms. I 10 100 1000 10 100 1000 Total. . I 3.— .METER. \\ heatstone Bridge Resistance Box. The most compart and the most easily portable form ofWheatstone bridge is undoubtedly the plug contact form in. INIVEKSITV OF TE.\.\S ll().\ which plug resistances are substituted for the stretched wireof the meter bridge. In the following we give a description 01the Universitv of Texas Resistance Box. as built by the L. E The one-ohm ratio coil can lie thrown into either arm de-sired by means of one of the traveling plugs supplied with thebox. An additional coil of 10,000 ohms is provided if coil can be thrown into either the rheostat arm or thenearer ratio arm, or can be cut out altogether by means of theordinary bridge plugs; or by the traveling plugs it can bethrown into the other ratio arm. It is therefore available for avariety of theoretical range of the bridge would therefore be fromi-io,ooolh ohm to ohms:or without the additional 10,000 ohm coil,i-i,oooth ohm to 11,110,000 actual working range of any plug is, of course, farinside even of the narrower of the above limits; being de-termined by plug contact resistances on the
Size: 1786px × 1398px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
