A treatise on pharmacy for students and pharmacists / by Charles Caspari, Jr.

  • Charles Caspari
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on pharmacy for students and pharmacists / by Charles Caspari, Jr. Source: Wellcome Collection.

    47/692
    Avill be ample. For measuring quantities less than two fluidounces the cone-shaped graduates will be found preferable to the tumbler- shape, but difficulty is often encountered in cleaning them properly, particularly the smaller sizes. The '^Acme'^ graduates, introduced a few years ago, possess the advantage of being made flat on the bottom, without a foot, and hence are less liable to be upset or broken ; they are admirably adapted for laboratory work, are cylin- drical in form, of about the same diameter as tumbler-shape gradu- ates, and can be had for both metric and apothecaries' fluid measure. (See Figs. 20 and 21.) Fig. 20. Fig. 21. Metric fluid measure. U. S. fluid measure. Acme graduates. Duplex graduates, arranged for apothecaries' fluid measure on one side and metric fluid measure on the other, are not to be recommended, on account of the danger of confusion and the greater difficulty of accurate measurement. Although minim graduates are extensively employed for measur- ing volumes of less than one-fourth fluidounce, it will be found more desirable to use minim pipettes (see Fig. 22) for quantities ranging from 5 to 60 minims; these instruments, first suggested by Dr. E. R. Squibb, are very accurately made and will be found extremely convenient. For measuring small metric volumes the graduated cubic centimeter pipettes of Dr. Curtman will be found very serviceable (see Fig. 23); they come in different sizes—5 and 10 and 25 Cc. capacity-—each cubic centimeter being divided into tenths, and are especially adapted to pharmacopoeial testing. As to the proper manner of holding a graduate while measuring liquids, it may be said that the firmest hold is obtained by grasping the graduate with the left hand in such a manner that the first or index finger encircles the lower part of the vessel, the thumb resting on the base and the second finger forming a support by being placed under the base; this leaves the third and fourth fingers free to remove