Differences

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--- glossary:glossary_b [2019/10/20 12:35] – [Back EMF] tom_shenton
+++ glossary:glossary_b [2020/09/14 14:43] – [Block Control] grovenor
@@ Line 6: / Line 6: @@
-Back EMF generally refers to the voltage generated by the rotation of a motor but also to the voltage that will appear across an inductor if the current is stopped suddenly.\\
+Back EMF generally refers to the voltage generated by the rotation of a motor but also to the voltage that will appear across an inductor if the current is changed or stopped suddenly.\\
 [[:glossary:back_emf|Main article]]
@@ Line 18: / Line 18: @@
-The BC3 is an automatic block control system otherwise known as SuperBloc (QV). It controls the speed of a model train depending on the occupation of the block ahead. If the block ahead is occupied the train will slow to a creep speed and stop at a designated point. Otherwise the train will accelerate to a preset speed. Manual control is also allowed for. Kits for the [[:kits:38|BC3]] and literature about it is available from MERG - TBs T33/0-20.\\
+The BC3 is an automatic block control system otherwise known as SuperBloc (QV). It controls the speed of a model train depending on the occupation of the block ahead. If the block ahead is occupied the train will slow to a creep speed and stop at a designated point. Otherwise the train will accelerate to a preset speed. Manual control is also allowed for. Literature about it is available from MERG - TBs T33/0-20.\\
-The BC3 kit is No38 Nos 39 and 40 are a test jig and a setting up kit. Kit instructions for 38 and 39 are available from MERG.\\
+although kits have been discontinued. The BC3 kit is No38 Nos 39 and 40 are a test jig and a setting up kit.
-[[https://merg.org.uk/merg_resources/superbloc.php|Superbloc]]\\
+[[:glossary:blong|Blong]]
-[[:glossary:blong|Main article]]
 ===== Bell signals =====
-Bell Signals are used as part of a block signaling protocol.
+Bell Signals are used as part of a block signalling protocol.
 The cadence of the Bell Signals were used to convey information. An example would be two bell rings would mean a train is entering a section and two rings followed by one ring may mean the train is clearing a section.
-Though there are some universal bell signals, different railroads at different times have had their own signaling schemes.
+Though there are some commonly used bell signals, different railways at different times have had their own signaling schemes.
 \\
 [[https://signalbox.org/block.shtml|THE SIGNAL BOX website - Block System]]
@@ Line 61: / Line 60: @@
-Block control is the philosophy that a railway should be divided into blocks and that no train should normally be allowed to enter a block which is already occupied. This means that each block has a stop signal at which a train is required to wait if the block ahead is occupied. This will be set back 0.25 mile from the start of the next block. Further back there will be a distant signal which informs the driver that he needs to slow because the signal ahead is at stop.\\
+Block control is the philosophy that a railway should be divided into blocks and that no train should normally be allowed to enter a block which is already occupied. This means that each block has a stop signal at which a train is required to wait if the block ahead is occupied. Further back there will be a distant signal which informs the driver that he needs to slow because the signal ahead is at stop.\\
 Modern electric signalling systems allow for more variation in slow signals with the a double yellow as a preliminary caution as well as the yellow caution to give two stages of slowing.\\
 [[http://www.signalbox.org/block.shtml|http://www.signalbox.org/block.shtml]]