Abstract: A stop is used with fishing rigs having sliding line weights on a fishing line. The stop can be clamped onto the line at any location as a stop for the weight. A long snell is no longer required. The stop can be released as required to allow the line to be reeled in as far as required to land a fish or to store the rig safely. The stop is a hollow body that will not pass through the eye of the weight, and a pin that slides into the hollow body. The line passes through a transverse bore through the pin. When the pin is drawn into the bore in the body, the line is jammed between the pin and the body, to clamp the stop in place. The pin may have a head on one end to capture the stop body between the line passing through the transverse bore and the pin head. With this arrangement, the stop may be self releasing. Sufficient tension applied to the line will pull the pin end out of the body. The stop will come free to slide along the line. Alternatively the stop may be set up for manual release.

Abstract: To ensure that only liquid helium is delivered to a cryostat dureing liquid helium refill, the arrangement automatically diverts hot gas which is produced during cooling of the transfer tube, away from the cryostat. The arrangement comprises a three way valve which is operated by pressure variations as a result of cooling part of an enclosed volume of helium gas to a temperature near the normal boiling point of the liquid at atmospheric pressure. The arrangement provides the advantage in that the transfer of helium to a cryostat now becomes very much a less skilled operation.