Servicing projection equipment (1932)

Page scan 00063 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00063
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Date Added:
May 15, 2025
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LIGHT SOURCE (Carbon Troubles) 47 too small for the current used, thus being overloading. Use only the size recommended for the lamp employed. (b) — If the size and type of carbon recommended for the current is employed, it is possible that the ammeter is out of order, giving a low reading which has deceived you into boosting the current value beyond the capacity of the carbon. Have the meter checked. 3. Short Carbon Life With H. /. (a) — The positive carbon is protruding too far forward and therefore burns excessively. Adjust the carbon so as to prevent sputtering and unsteadiness and also to reduce the carbon consumption to a minimum. 4. Crater Area Too Small (a) — Excessive needling is due to continual overloading. Check the meter if the area has decreased and the spindling has increased, for, due to meter inaccuracy, an excessive current is perhaps being employed unintentionally. If this is the trouble, reduce the current. (b) — This may also be due to a bad electrical contact, especially so in H.I. lamps of that type in which the current passes both through the carbon length through the holder, and through a "V" rest.