Note 91 — A CYCLOPÆDIA OF PRACTICAL RECEIPTS, PROCESSES, AND COLLATERAL INFORMATION (continued 11)
Reading edition
This use of animal charcoal may also be advantageously extended to the other formulæ. Mr C. G. Williams, in Ure’s ‘Dict. of Arts, M., & M.,’ 4th ed., directs the shoots to be used when of “a length of 2 inches;” but some authorities recommend them to be of 9, 12, or even 15 inches. The selection must, however, in many cases, depend upon circumstances and convenience.