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2. BSA Ultra - Wikipedia

   en.wikipedia.org/wiki/BSA_Ultra

   The count is 35 shots/fill in .177 when cylinder is set to 232 bar. The lower shot count in .177 is because .177 pellets travel at higher speeds than .22 and hence more 'charge' is required to power them. It is now possible to get after-market pressure regulators fitted to Ultra's which give up to 100 full power (12 ft pound) on one charge.

3. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   BS 84: Tables of BS Whitworth, BS Fine and BS Pipe Threads: V Thread Form (55°) 1 ⁄ 4 ″-20 BSW ISO 68-1:1998: ISO general purpose screw threads—Basic profile—Part 1: Metric screw threads: V Thread Form ISO 68-2:1998: ISO general-purpose screw threads—Basic profile—Part 2: Inch screw threads: V Thread Form ISO 261:1998

4. British Standard Whitworth - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Whitworth

   Whitworth's new standard specified a 55° thread angle and a thread depth of 0.640327p and a radius of 0.137329p, where p is the pitch. The thread pitch increases with diameter in steps specified on a chart.

5. British Standard Pipe - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Pipe

   British Standard Pipe (BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external thread with an internal (female) thread.

6. Buttress thread - Wikipedia

   en.wikipedia.org/wiki/Buttress_thread

   In oil field tubing, buttress thread is a pipe thread form designed to provide a tight hydraulic seal. The thread form is similar to that of Acme thread [10] but there are two distinct threaded portions of differing diameters and profiles, the larger having a wedging profile, with a tapered sealing portion in between the larger and smaller diameters.

7. Ultra-short baseline acoustic positioning system - Wikipedia

   en.wikipedia.org/wiki/Ultra-short_baseline...

   USBL (ultra-short baseline, also known as SSBL for super short base line) is a method of underwater acoustic positioning. A USBL system consists of a transceiver, which is mounted on a pole under a ship, and a transponder or responder on the seafloor, on a towfish, or on an ROV. A computer, or "topside unit", is used to calculate a position ...