67

Standard Type of Wheatstone Bridge. (Fig. 9.)

For accurate measurements, with coils specially prepared and protected for use in any climate; the outcome of many years’ experience with these resistances abroad.

Frn. 9.

Short-Range Series Resistance Box.

For accurate measurements.

Direct Reading Wheatstone Bridge. (Fig. 10.)

Has figures representing the actual resistance in circuit always visible. Four-dial pattern, with laminated switch contact arms. Dust-proof tapper keys are provided as shown in the illustration,

2

pH

P.O. Form of Wheatstone Bridge.

For commercial measurements, with blocks well undercut for insulating and cleaning; all plugs carefully fitted and blocks rigidly fixed.

E2

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