these requisites has been in common use in the writer's store for seven or eight years, and is now in every way reliable. During this time it has not cost anything for necessary repairs.

Figure 1. Represents balance and case in section looking at the front of same.

CCC. Case.

B. Beam.

P. Plate supporting beam and appendages.
L. Levers.

F. Fulcrum of lever raising the beam, motion being communicated by the rod R from levers L under iron table of the bal

ance.

T. Iron table of balance being bottom of the case.

S. Supports for the beam when not in use.

Figure 2. CCC. Case.

LL. Levers for raising beam.

GGG. Guides to steady the planes for centre knife-edges and ends of connecting rod.

G'G'G'. Plates of glass for principal case and inside beam

case.

FF. Fulcra for raising levers.

Figure 3. CC. Case.

B. Beam.

S. Supports to beam when not in use.

G'G'G'. Plates of glass to principal and inside beam case. Figure 4. LL. Levers for moving frame to raise the pallettes which prevent the oscillations of the beam.

Figure 5. Stirrup supporting the bows which carry the scale

pans.

The beam (figure 1) is supported on a plate of iron or brass inserted in grooves cut into the sides of the case, and forming a division in the case nearly from the front of it to the extreme back, the edge of it resting against the plate glass G'.

The planes, upon which the centre knife-edges rest, are elevated by a series of levers, working underneath the iron table of the scale case, the motion being carried up at the back of the case,

leaving the entire table clear of everything but the scale dishes, it is thus much more easily cleaned. The knife-edges at each end of the beam are relieved of their load by the stirrups resting in appropriate slots made in the supports SS; the beam itself, when not in use, rests in grooves of appropriate shape cut in the supports SS, and is brought to its proper place by two cones fitting into corresponding conical cavities near the ends of the beam, just before it is brought into use; the upper part of the case, in front of the plate P, has a plate of glass, G', extending to the top of the case, thus insulating the beam and its supports from the rest of the case.

The other figures are sufficiently explained by the reference letters.

The top of the case is made with an opening in the centre, which permits the beam to be removed to clean or adjust it more easily than could otherwise be done.

DESCRIPTION OF A NEW PATENT BALANCE FOR USE WITHOUT WEIGHTS.

BY EDWARD PARRISH.

The primary object of this invention is to save the expense and annoyance attendant on the loss of weights in ordinary retail business; but it has been, at my suggestion, adapted to the use of the apothecary by introducing upon the disk a scale of Apothecaries' weights along with the ordinary avoirdupois scale, so that in every instance the weight in troyounces and in commercial or avoirdupois ounces and pounds is made to appear at a glance. The advantage of this arrangement will be apparent to every pharmaceutist. It obviates the necessity of keeping at hand an extra set of large officinal weights, often difficult to obtain and always expensive; it also facilitates the weighing of larger quantities at a single weighing than is practicable with the ordinary cup weights,an advantage in the preparation of fluid extracts and syrups.

When the pointer is at 0, the brass disk and its supports are balanced by the plate and its supports, the free movement of the lever being facilitated by four steel knife edges at the fulcrum of the lever and at the bearings under the plate.

The size here figured is suited to weighing five pounds avoirdupois when the pointer is set at the point indicating that amount on the extreme right, or seventy-two troy ounces, which is indicated very near the same point on the inside scale. The principle, which is not new in weighing, will be understood from the drawing, and will, I think, be found very convenient as applied to this instrument.