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--- glossary:glossary_h [2013/04/10 13:24] – [Hysteresis loop] Bob Vetterlein
+++ glossary:glossary_h [2019/02/06 22:48] – [Hysteresis loop] Bob Vetterlein
@@ Line 7: / Line 7: @@
-This a transistor type that is effected by a magnetic field placed in close proximity     \\ See MERG TBs A7/2/ 3/ 4 merg members only
+This a transistor type that is affected by a magnetic field placed in close proximity     \\ See MERG TBs A7/2/ 3/ 4 merg members only
@@ Line 13: / Line 13: @@
-Is a means of control in your hand.     \\ {{:glossary:handset.jpg}}
+Is a means of control in your hand.     \\ {{:glossary:handset.jpg}} {{:glossary:92-cancab-c.jpg?direct&200|}}
+===== Handshaking =====
+In information technology, telecommunications, and related fields, handshaking is an automated process of negotiation that dynamically sets parameters of a communications channel established between two entities before normal communication over the channel begins. It follows the physical establishment of the channel and precedes normal information transfer.
+===== HASL =====
+[[https://en.wikipedia.org/wiki/Hot_air_solder_leveling|Hot Air Solder Leveling]]\\ HASL = hot air solder levelling - the bare copper of the etched PCB would soon oxidise and refuse to take solder, so a thin layer of "something" is added to make the shelf life longer. The standard HASL provided by Chinese manufacturers is leaded solder. More expensive options are lead free solder, organic solderable varnish stuff, nickel, or gold flash.
 ===== Header plug or socket =====
@@ Line 33: / Line 38: @@
-This is a track detector using an optical system to detect the location of train Merg kit for members
+This is a track detector ([[glossary:glossary_t#toti|ToTi]]) using an optical system to detect the location of a train.
+Merg kit (for members only)
@@ Line 42: / Line 48: @@
-===== HYPOTRAC =====
+===== H0 =====
+Scale and gauge common in  America, Asia and Europe but excluding UK. Scale 1:87, gauge 16.5 mm.
+===== HYPOTRAC =====
 This a high voltage track detector system for 2 rail Model railway track , see TB T9/2 merg members only
@@ Line 51: / Line 60: @@
-Hysteresis is wellknown in ferromagnetic materials. When an external magnetic field is applied to a ferromagnet, the ferromagnet absorbs some of the external field. Even when the external field is removed, the magnet will retain some field: it has become magnetized.\\
+Hysteresis is well known in ferromagnetic materials. When an external magnetic field is applied to a ferromagnet, the ferromagnet absorbs some of the external field. Even when the external field is removed, the magnet will retain some field: it has become magnetized.\\
 [[wp>Hysteresis|Hysteresis]]