Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Date:
1914
Author:
Gage, Simon Henry, 1851-1946
Publisher:
Ithaca, N.Y. : Comstock Publishing Co.
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Leaf #:
000524
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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CH. XIII] POLARITY TESTS 509 position of the wires in the binding posts of the voltmeter. Turn on the current and the voltmeter will register. It is well to mark the insulation of the positive wire with red, or in some .other way. FIG. 272. VOLTMETER FOR TESTING POLARITY. G Dynamo for direct current. The positive pole is above and the negative pole is below, as indicated by the arrows. Vm The terminals of the voltmeter are correctly connected across the line (in multiple) or to both wires and the hand indicates the voltage on the dial. If the terminals were wrongly connected the hand would not register. A Arc lamp. R Rheostat. The arrows indicate the direction of the current. The -} and — signs indicate that any point in the circuit nearer the positive pole of the dynamo is positive to any point nearer the negative pole. FIG. 273. AMMETER FOR TESTING POLARITY. G Dynamo for direct current. The positive pole is above and the negative pole below. Am Direct current ammeter. The terminals a +, — b are connected along one wire (in series). If the positive pole of the ammeter is connected to the circuit next the positive pole of the dynamo, and the negative terminal in the wire toward the negative pole of the dynamo, as here shown, the hand will register when there is current flowing. If the connections are reversed the hand will not register when the current is flowing. a+, — b The positive and the negative terminals of the ammeter. A Arc lamp. c+ The positive carbon. c — The negative carbon (the minus sign is put parallel with the carbon to show the direction of the current). R Rheostat. The + and — signs and the arrows are as with the voltmeter (fig. 272).