The quality of the malt made is considerably improved. The percentages
of acidity are much reduced. The stability of the beer is increased,
and a greater percentage of the extractive matter of the barley is
obtainable by the brewer.--_The Engineer_.
* * * * *
NON-SPARKING KEY.
Profs. Ayrton and Perry lately described and exhibited before the
Physical Society their new ammeters and voltmeters, also a non-sparking
key. The well known ammeters and voltmeters of the authors used for
electric light work are now constructed so as to dispense with
a constant, and give the readings in amperes and volts without
calculation. This is effected by constructing the instruments so
that there is a falling off in the controlling magnetic field, and a
considerable increase in the deflecting magnetic field. The deflections
are thus made proportional to the current or E.M.F. measured. The
ingenious device of a core or soft iron pole-piece, adjustable between
the poles of the horseshoe magnet, is used for this purpose.
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