A rounded wooden block with hole used to set up ship's stays
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PLUG-AND-FEATHER HOLE
A hole drilled in quarries for the purpose of splitting a block of {
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PERMISSIVE BLOCK SYSTEM
A block system in which a railroad train is permitted to enter a block section already occupied by a train.
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NAILER
A wood strip or block which serves as a backing into which nails can be driven.
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MULTIPLE-LOOP SYSTEM
A system whose block diagram has at least two closed paths, along each of which all arrows point in the same direction.
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METER WHEEL
A special block used to support the oceanographic wire paid out over the side of a ship; attached directly or connected by means of a speedometer cable to a gearbox which measures the length of wire.
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LIMELIGHT
A light source once used in spotlights; it consisted of a block of lime heated to incandescence by means of an oxyhydrogen flame torch.
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LENGTH OF SHOT
The depth of the shot hole, in which powder is placed, or the size of the block of coal or rock to be loosened by a single blast, measured parallel with the hole.
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KEEL BLOCK
A docking block used to support a ship's keel.
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JOHANSSON BLOCK
A type of gage block ground to an accuracy of at least 1/100,000 inch (0.25 micrometer). Also known as Jo block.
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HOME SIGNAL
A signal at the beginning of a block of railroad track that indicates whether the block is clear.
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