. The Pharmaceutical era. te knife edges,bearing upon plane orslightly concave piecesof similar material. Theonly points at whictfriction can operate areat the points of contactof the knife edges andtheir bearings, by whichmeans friction is re-duced to a minimum. In the torsion balance, the beam is firmly attachedto a flat steel band tightly stretched upon a strong metulframe. When the beam oscillates, the band twists from,side to side,and thistwisting or torsion gives to thfinstrumen tits supportsof the panstirrups arealso con-structed in asimilar man-ner. Delicacyis secured bymeans
. The Pharmaceutical era. te knife edges,bearing upon plane orslightly concave piecesof similar material. Theonly points at whictfriction can operate areat the points of contactof the knife edges andtheir bearings, by whichmeans friction is re-duced to a minimum. In the torsion balance, the beam is firmly attachedto a flat steel band tightly stretched upon a strong metulframe. When the beam oscillates, the band twists from,side to side,and thistwisting or torsion gives to thfinstrumen tits supportsof the panstirrups arealso con-structed in asimilar man-ner. Delicacyis secured bymeans of anadjustableweight placedover the cen-ter of thebeam in such a manner that its elevation raises the center of gravityalmost to the point of unstable equilibrium. The objectof this device is to overcome or neutralize torsional re-sistance, or the resistance which the band opposes tobeing twisted. When properly constructed, torsion balances are fairlydelicate, quick acting, durable and available for a varietyof Fig. 4.—Torsion Analytical Balance. STOVE POLISH.—Molasses is evaporated in a vacuumpan as nearly as possible to dryness. To the residue asmuch graphite is added as it will take up, and the mix-ture made homogeneous by passing between rollers orflat stones. The mass must be kept dry to prevent it moldy. (Drog. Ztg). / May 5, 1898.] THE PHARMACEUTICAL ERA. 66s (Special CoiTCvpondfHOf) GREAT BRITAINS NEW PHARMACOPEIA. London, April 12. After much hard work and a tremendous amount ofrevision the advance copies of the new British Pharma-copoeia liave been issued, and by the time Era readersperuse this it is most probable that their English con-freres will have their new guide and companion to workfrom. The general appearance of the text of the work ismuch the same as in the 1885 edition, but when one set-tles down to read it carefully the alterations are foundspeedily and continuously, and speaking from the opinioncreated by a short perusal only
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
