Bells Indicators Telephones Fire And Burglar Alarms Etc
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In our eReader you can find the full English version of the book. Read Bells Indicators Telephones Fire And Burglar Alarms Etc Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Bells Indicators Telephones Fire And Burglar Alarms Etc
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26.
Combinations of each of the above-mentioned pendulum indicator movements, as they appear when mounted up in what are termed " Indicator Boards, " with their flags in position behind the apertures in the screen plate, are shown alongside in Figs. 25 and 26.
(27) MANUALLY RESTORED INDICATORS Wherever vibration is likely to be encountered the second class, or manually restored indicator, is used, Fig. 27. In this type of movement the signal consists of a displayed disc, which, when the indicat...or is normal, or inactive, remains hidden behind a screen, 38 BELLS, INDICATORS, TELEPHONES, pierced with holes, numbered or labelled to corre- spond with each indicator. The disc is attached to a pivoted arm, which engages with a detent con- trolled by the armature of the electro-magnet, such that when the latter is energized the detent releases the arm, and allows the disc to fall into full view behind its aperture in the screen. This type of indicator is restored by pressing a knob at one end of the case.
What to read after Bells Indicators Telephones Fire And Burglar Alarms Etc?
You can find similar books in the "Read Also" column, or choose other free books by J B Redfern to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
26.
Combinations of each of the above-mentioned pendulum indicator movements, as they appear when mounted up in what are termed " Indicator Boards, " with their flags in position behind the apertures in the screen plate, are shown alongside in Figs. 25 and 26.
(27) MANUALLY RESTORED INDICATORS Wherever vibration is likely to be encountered the second class, or manually restored indicator, is used, Fig. 27. In this type of movement the signal consists of a displayed disc, which, when the indicat...or is normal, or inactive, remains hidden behind a screen, 38 BELLS, INDICATORS, TELEPHONES, pierced with holes, numbered or labelled to corre- spond with each indicator. The disc is attached to a pivoted arm, which engages with a detent con- trolled by the armature of the electro-magnet, such that when the latter is energized the detent releases the arm, and allows the disc to fall into full view behind its aperture in the screen. This type of indicator is restored by pressing a knob at one end of the case.
What to read after Bells Indicators Telephones Fire And Burglar Alarms Etc?
You can find similar books in the "Read Also" column, or choose other free books by J B Redfern to read onlineMoreLess
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