The line throwing apparatus has been in use for several centuries, in a wide variety of forms. It initially started off as manually launched lines that had shorter ranges and were not very accurate. They faced problems on wind-powered boats and ships since they were dependent on wind speed, wind direction, and the operator accuracy.Modern-day line throwing apparatus are powered using rockets, pneumatic systems, or slingshot mechanisms. They fall under two main categories of propulsion- pyrotechnic, and pneumatic. Pyrotechnic systems make use of an ignition that is used to launch the line, whereas pneumatic systems make use of built-up pressure. Pyrotechnic systems are volatile and can be extremely dangerous due to accidental ignition. In response to growing concerns about the safety of pyrotechnic systems, pneumatic based launchers were invented and widely implemented in the late 20th century.Yellow line throwing device consisting of a canaster containing rolled rope and a firing mechanismPains-Wessex Speedline International. Pt No 5151-01/02speed line, line throwing, marine rescue, pyrotechnics

Foolscap Manila Folder titled "PCM Tram Equipment" with the following papers secured with an Arnos binder. Many of the documents seem to have been copied onto heat sensitive paper. Have tissue paper separating them. 1. Wiring Diagram - GE PCM Control Equipment - R4284B. 2. Westinghouse - Load test on Repair Railway Motors 3. Letter to Chief Engineer MMTB from Australian General Electric - 23/7/1935 - re delivery of 15 cases of PCM Equipment by ship and attaching drawings. 4. Drawings and maintenance notes for above - includes field shunts, magnet valves, cases, 5. GE Specification Ry-5313 - General Electric PCM Control for 4-40HP 600Volt Motors with Shunted FieldsOn rear cover in ink "To Norm Cross"trams, tramways, electro pneumatic, pcm, controllers, general electric, mmtb, tramcars