Some early single hose scuba sets used full-face masks instead of a mouthpiece, such as those made by Desco and Scott Aviation ( who continue to make breathing units of this configuration for use by firefighters ).

Some diving instructors continue to teach single demand valve buddy-breathing as an obsolete but still useful technique ; then they show the method that has superseded it, since availability of two second stages per diver is now assumed in recreational scuba.

< center > Some remoras, such as this Echeneis naucrates, may attach themselves to scuba divers.

Some say that technical diving is any type of scuba diving that is considered higher risk than conventional recreational diving.

* Some scuba diving clubs have an entry class called " Tadpoles " for younger children who want to start scuba diving.

Some of the first training started in 1952 at the Scripps Institution of Oceanography where Andy Rechnitzer, Bob Dill and Connie Limbaugh taught the first scuba courses in the United States, then in 1953 Trevor Hampton created the first British diving school, the British Underwater Centre and in 1954 when Los Angeles County created an Underwater Instructor Certification Course based on the training that they received from the scientific divers of the Scripps Institution of Oceanography.

Some divers accustomed to open-circuit scuba get into a habit of casually letting small amounts of water leak in between the lips and the mouthpiece and blowing it out the next time the diver exhales.

Some authors said that the invented diving apparatus was very similar to modern scuba equipment

Some of the extracurricular activities offered at IA's central campus include FIRST Robotics ; buildOn ( formerly known as Building with Books ); Science Olympiad ; scuba diving classes and international dive trips ; Biology and Physics Olympiads ; Political Debate Club ; Model United Nations ; Quiz Bowl ; the Phoenix Theatre Company ; Forensics ; various ethnic organizations such as the Indian-American Student Association, the Asian Student Association, and the Black Student Association ; religious organizations such as the Christian Student Initiative and the Muslim Student Association ; a Gay-Straight-Whatever Alliance ; an active photography club ; DECA ; and various environmental groups.

Some scuba divers and freedivers can create bubble rings by blowing air out of their mouth in a particular manner.

Some activities available at the resort are swimming, snorkelling, scuba diving.

Some sources say that the engines and sections of the bow remain in Fairlight and are accessible by scuba divers.

Some mathematicians, especially in set theory, do not consider the sets and to be part of the relation, and therefore define a binary relation as being a subset of x, that is, just the graph.

Some of these are challenging to sequence because they have more than two haploid ( n ) sets of chromosomes, a condition known as polyploidy, common in the plant kingdom.

As noted above, this terminology is not universal: Some authors use countable to mean what is here called " countably infinite ," and to not include finite sets.

Some sets are infinite ; these sets have more than n elements for any integer n. For example, the set of natural numbers, denotable by, has infinitely many elements, and we cannot use any normal number to give its size.

Some undefined conversation is shared lazily, the sun sets ; then Marlow states how their location also " has been one of the dark places of the earth.

Some companies have a telecom team that is responsible for the phone infrastructure such as PBX, voicemail, VOIP, telephone sets, modems and fax machines.

Some sets are specific to a locale, or even to a single session, whilst others, like the " Coleman set " of reels (" The Tarbolton "/" The Longford Collector "/ The Sailor's Bonnet "), represent longstanding combinations that have been played together for decades.

Some sets include racks to hold tiles ( if they are shaped small or differently ).

Some references require a null set to be measurable ; however, subsets of null sets are still negligible for measure-theoretic purposes.

Some authors consider merely finitely additive probability spaces, in which case one just needs an algebra of sets, rather than a σ-algebra.

Some RISC processors such as the PowerPC have instruction sets as large as, say, the CISC IBM System / 370 ; and conversely, the DEC PDP-8 — clearly a CISC CPU because many of its instructions involve multiple memory accesses — has only 8 basic instructions, plus a few extended instructions.

Some medications produce an increased risk of seizures and electroconvulsive therapy ( ECT ) deliberately sets out to induce a seizure for the treatment of major depression.

Some wheat species are diploid, with two sets of chromosomes, but many are stable polyploids, with four sets of chromosomes ( tetraploid ) or six ( hexaploid ).

Some bands are even using small plastic pouches that hang about their neck on an adjustable strap, which has a zipper pocket for holding drill, flags to mark sets, and a pencil.

Some television sets can be set to automatically turn captioning on when the volume is muted.

Some observers hold that individuals apply distinct sets of moral rules to people depending on their membership of an " in-group " ( the individual and those they believe to be of the same culture or race ) or an " out-group " ( people not entitled to be treated according to the same rules ).

Some sets of keyboard variations, such as The Hunt's Up and the imperfectly preserved set on Gypsies ’ Round also seem to be early works.

Some sets are released in many countries, while others are only issued in one or two.

* Some sets are neither open nor closed, for instance the half-open interval < nowiki >

Some low-cost sets ( especially those sold in toy stores ) may use red and black squares and include pieces for both games ; though suitable for informal play, such boards are often not accepted for sanctioned play, depending on the local authority's rules on equipment standards.

Some operations available in most instruction sets include:

Some pieces incorporate plastic, acrylic, leather or wood.

Some Christians who view the Jewish people as close to God seek to understand and incorporate elements of Jewish understanding or perspective into their beliefs as a means to respect their " parent " religion of Judaism, or to more fully seek out and return to their Christian roots.

Some professional dominatrices are also " lifestyle " dominatrices-i. e., in addition to paid sessions with submissive clients they engage in unpaid recreational sessions or may incorporate power exchange within their own private lives and relationships.

Some shelters, however, incorporate NBC-filters for additional protection.

Some guitarists incorporate a Latin jazz influence, acid jazz-style dance club music uses samples from Wes Montgomery, and guitarists such as Bill Frisell continue to defy categorization.

Some early Church Fathers, especially those in the West, sought to incorporate natural law into Christianity.

Some wrestlers will incorporate elements of their real-life personalities into their characters, even if they and their in-ring persona have different names.

Some examples of canes — those known as sword canes or swordsticks — incorporate a concealed blade.

Some snowboards incorporate the use of more exotic materials such as Carbon Fiber, Kevlar, Aluminium ( as a honeycomb core structure ), and have even incorporated Piezo dampers.

Some taekwondo instructors also incorporate the use of pressure points, known as jiapsul, as well as grabbing self-defense techniques borrowed from other martial arts, such as hapkido and judo.

Some tatting designs incorporate ribbons and beads.

Some of these tracking systems are beginning to incorporate the use of handheld computers, and in some cases, bar code scanners.

Some winemakers choose to harvest their grapes at different ripeness levels in order to incorporate these different elements and potentially add some layer of complexity to the wine.

Some visual chat rooms also incorporate audio and video communications, so that users may actually see and hear each other.

Some also include the front ensemble keyboard percussion, and may also incorporate the use of a color guard for flag and rifle routines.

Some countries incorporate bus lanes onto highways.

Some debuggers also incorporate memory protection to avoid storage violations such as buffer overflow.

Some drafting tables incorporate electric motors to provide the up and down and angle adjustment of the drafting table surface.

Some griddles designed for stove-top use also incorporate raised ridges in addition to a flat cooking area.

Some modern painters incorporate different materials such as sand, cement, straw or wood for their texture.

Some cable modems may incorporate a router and a DHCP server to provide the LAN with IP network addressing.

Some of the large fast food chains are beginning to incorporate healthier alternatives in their menu, e. g., white meat, snack wraps, salads, and fresh fruit.

Some reasons for this situation may be the failure of the evaluator to establish a set of shared aims with the evaluand, or creating overly ambitious aims, as well as failing to compromise and incorporate the cultural differences of individuals and programs within the evaluation aims and process.

Some incorporate an adaptor plug which includes a 610 socket, often with all six conductors connected, allowing the extension to also serve as a double adaptor.