Chemical Instrumentation S. 2. LEWIN, New York University, Washington Square, New York 3, N. Y. of ammeters and voltmeters, shunts and multipliers, etc., and he must be careful not t o connect the recorder with the wrong polarity, or t o s. circuit t h a t will send an excessive current through the coil. Since these recorders are much more expensive than ordinary indicating meters, a wise rule to follow is: never conned a recorder to a cilrvit until the output has been texted on
T h i s series of articles presents a survey of the basic principles, characteristics, and limitations of those instruments which find important applicatias in chemical work. The emphasis i s on commercially available equipment, and approximate prices are quoted to show the order of magnitude o f cost of the various types of design and construction.
an indicating meter of the same resistance.
6. Recording Devices (Continued)
Curtiss-Wright Corp. A complete line of direct-writing meters is svailable from the Curtiss-Wright Corporation, Princeton Division, Princeton, New Jersey. These contain a conventional D'Amonval meter movement. de
