F. H. Richardson's bluebook of projection (1935)

Page scan 000292 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000292
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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274 RICHARDSON'S BLUEBOOK OF PROJECTION Care of Commutator, page 317 139. What results from a commutator sparking? ■>-<jK"140. What deficient elements invariably cause trouble? 141. How should a commutator be brushed? 142. How can the commutaor surface be cleaned right down to the copper? 143. After sanding a commutator what should be done__beiore it is put in operation? > ^Ugyy, f t+*A>+^<&* 144. What is a commutator stone and how is it used? 145. After using a commutator stone what must be done? ^< 146. Describe the method of making a commutator lubrication pad. 147. Should there be any sparking if the dynamo is not overloaded? --WO, '.^,^9>i^/M^ 148. What causes sparking? 149. How are high commutator bars usually detected ? 150. What does a slight motion of the brushes in the holder indicate? 151. How would you test for an out-of-rqund commutator? 152. Summarize the items on a commutator that need watching and correction? **,'■ •-" '. 153. Why do brushes stick in their holder? How can it be corrected ? 154. Do commutator bars wear thin and require replacing ? -^Xo . 155. Do soft commutator bars wear faster? 156. What does an overheated brush indicate? 157. Do worn bearings cause excessive sparking at brushes? 158. What occurs when an armature coil is short circuited? 159. How is a sprung (bent) armature shaft evidenced and what should be done about it? +-*6-\ 160. What are the results of overloading? 161. Will a properly designed generator stand overloading? Is it good practice? 162. What would you regard as evidence of a weak field? How does it affect the motor ? jUjh\^^j^ 163. What causes a weak field? How would you test for it? 164. If you discover excessive vibration in a new generator set, should it be refused? 165. What does a ring of fire around the commutator indicate? What should be done?