Submarine Appliances And Their Uses
Deep Sea Diving, &c., &c.

Management of the Diver’s Ascfnt timC f°r aI1 thc stops except the first one vious stop. ne> from Deep Water.—In coming up, the is to be counted from the end of the pre- depth than the diver is actually a?’ Sh°WS a sli«htly higher pressur the air pipe) when the gaug-e indicaM ’'s rea.son he should be stopped (by Stopping-place. The pump Tth " «on 5“ ^P‘h “ ' to overcome any sluggishness of its ' T ' a"d the frOnl up, which he should do XX unt I h' ’ « * then restarted. If the diver overshoot^th "P,ped the rl?ht depth. ~ down again to the proper depth but he n, "T '‘P t0° far’ he must' be sent descend, other-wise he may squeezed. P restart^ before he begins to rectness of thrir Indicatio^of’depü.s'fröm îoft TrT aS regards the P from loft. to 60ft. has already been mentioned. Extra Precautions aftør «» ç j r. time into deep -water with an interval of“« thaTivjTd'Ve'' descends a second body w,ll be more highly saturated with nitroX 1 th“” TT'Ï the ‘W° dives- his extra care is needed in bringing him Un A «7? 1 end °f the second dive, and the bottom in the two dives, and use the corr^ IS tO add to^ether the times on or Table II. The extra time is howeverOT"“"’f J™i°ns shown in Table I. stoppages. er’ onl? needed for the second half of the ,Sh0WS ? sli.8ht|y higher Pressure or greater . J one pull on as about 30ft. below the first ■atinn<= k-1 "L Oi,the gauge lig'htly tapped a 10ns, while the diver is signalled to come The pump is 3 > H E* O > tr rt> w o —H l—■“ C» <x Q- , O g. •t £ Ä t5 W t5 -• “ ° ” <? S' o w p. re rt> 5" ri ri 0 s > 4 <z> d âê § 5-^C 3 « B ~ (T> r-b M as 3 CX ex rc a' — ex nT Q- £ c rg «5* 2. QTQ W. ta CZ5 rf - < 2 > ? ~ o- ezi B ■* o 3 5' S h— p - § 1 » 3 o- a » S o ® t*’ S r> ö - ro arc? Depth. 1 Pressure Pounds per Square Inch. Time under Water, i.e. from Surface to ’ Beginning of Ascent. ♦* Stoppages in Minutes at different Depths. Total i Time fo Ascent in . ! Minutes. 1 Number r ! of Cylinders ! needed f Re vol u- tions of ! Pump per ! Minute, f Feet. Fathoms, 60 ft 50 ft . 40 ft . 30 ft • ;20ft. 10 ft 0—36 0-6 0-16 No limit — : —.— ' ' ■ — 0 to 1 1 1 15 to 20 36-42 6-7 J Up to 3 hrs. (Over 3 hrs. .. I6-18J — • — — , — itoin 6 J —.—. — — —, 1 — 1 — 1 5 1 25 to 30 42-48 7-8 18J-21 ( Up to 1 hr. .. — — — 1 — — 1 — H) — — ' Over 3 hrs. ’ ' — — — — 5 i 30 — — - 10 48-54 8-9 21-24 to 1 hr. .. J i to 1 j hrs. — — — 2 ) (' — /HtoJhrs. ” •• — — — — — 5 7 1 I Over 3 hrs. ' ’’ ■—" 1 — — - To 12 1 ■2 20 f U.P to 20 mins. I to I hr..’ 4 to 1J hrs. — - 20 22 J 54-60 9-10 24-26i ■— — — — 5 2 ) 7 I 1 i to 3 hrs. •— — — — 10 12 t 2 • Over 3 hrs. .. — — 5 15 I 10 20 J 1 22 1 32 J 25 See foot.notes on next page