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These Features Make DART UNIONS OUTSTANDING revolving field.); I, ^ secondary current Inrush- anJjrfS factor allowing for voltage drB, s V*8 line at starting, motor intpedan, &* leakage. Factor K equal* gi rV.'Sj site motor allowing 200% cu iv!? rush. rrei,*'i&L For ipc'd control, reii,t,,, AS o desired speed reduction is d,i. " *lt*3S for n Yconnected circuit by Where /< is tol.l equlvolent tesi.u'^1 of the motor including line- v_*.v4 with rotor locked; S, slip (,, 'Wfl secondary current. VJa The various resistance steps ntsyW Imanently insulated to resist heat - OIL - GREASE - MOISTURE - FLAME From the three basic designs illustrated Rockbcstos has developed it complete line of 145 failure resisting wires, cobles ond cords, a few of which arc described. All have the same performance guaranteeing characteristics do* tailed below. Writo for a catalog or samples... r ockbeitoa Permanent Insulation Insure* Lonp-Uved^Servfeo 1 A tough impregnated aibeito* braid, resbUnt to heat'. Sane, moisture, oil, grease, alkalies and corrosive fumea. 2 Felted asbestos insulation impregnated with heat. Dame and moisture resisting compounds will not dry out with age, burn, or bake brittle under- high temperatures. 3 Lubricated varnished cambric for high dielectric strength and added moisture resistance -- protected from heat, flame ana oredatioo by felted asbestos'walls. >. 4 Impregnated asbestos insulation that withstands heat of overload* ana aging eod won't become brittle, crack, rot or burn. 5 Conductors ere perfectly centered in helically applied non-flowing insulation.and will always remain so. - 144 (2S4c) . D** ie ^ l*JI .14 b*\ If**` b4 sltlS o0l>`e*\cViWtil cV* eCooO iec fct v>e*r o*' o?t0 RUGGED construction t Body *nd ^^^estruct,b Your supplier will gladly show you these outstanding money-saving features. E. M. DART MANUFACTURING CO. PROVIDING! I, ANODE ISLAND V'j pjfiftDierni J00101T BEAT Rf&ISTOO FUTURE WIRE h.f; -. (UsdcrertUrs* Trm t-iiS X*. 10 U It AtKC MnadtH fUiwaafmr etmtodu IfSIwB ai r su* wreMur/su fttfTw viWW WU. Jt-jlockbesloi asbestos insulated fixture wires, KJsppieved by the Underwriters* Laboratories ff- hr;lighting fixture wiring, will not boke nut Kinder the nigh socket temperatures developed E'B Dodttn high-wattage fixtures. Also used fclw roull motor aad apparatus leads, switch* ^boards. etc. (HkUTOS O.V.C. m volt sotua room> wire f (National KWtrim) Cod*. Ts-p* AVA) - Sim Vo. IIlot A WOiWtuf vui n/niilidcaw&ris. frifwaltd/dlti aibtdo* a*d ailtMa* Emid. BLui I it I/O Arm tnaliar watt a/JdUd aak*da* --at M Itr uadudar. For lighting and control circuits exposed to beat and moisture, oil, grease, corrosive fumes or fire hasard around furnaces, ovens, :lehrs, soaking pits, boilers, etc., this permanently insulated wire is ideal. It won't bake brittle, crack, rot, flow or swell. UST"I Mil |J ROCKBUtOS SCO VOIT NEAT REStSTINQ OOPUR FLEXIBLE CORD - (Uaderwritm'TVpe At-TO) Siiaa ft*. 10 la II AWO alfanitd Uaia aoppar aaadmaOft iwW*W vftk impt*r*eud/dud aaUttaa. palariud. twsalad laenSat and tsrrnd wiU a Mtoa Braid. This heat-resisting cord is approved for use ia lighting fixtures and is recommended for pendant types ns it docs not dry out or crack at the socket. Also cn apparatus and appliances which develop Kent in operation or aro used in hot. dry places. Twisted pair, tripled or triplex constructions also available. depicted graphically upon the abort* characteristic curves at follows: cum-, /?., which gives maximum torque at-1* standstill is followed until it reW^ the fulMoad torque line where the A]? troller may remain if thot particularf speed is desired. If the next higher... speed is desired, a horizontal line hfy drawn to the Rt curve and the motor^ will accelerate along this curve uotilf; .MneuoTM av.c. soo volt iwttchboard wire ROCKBCSTOS THERMOSTAT COtfTRM. WIRE titfi . (Nsiloaal Klretrici) Code, TrM AVB) Sim S'*. 11, IB aad It AWO ia Imala/lwafaadatta'* milt ly-tin AV II I* S'*. */0 A VO tnli 'uW c*W **J jDlir'. MiU or (Jor lit (oil Itnkr) Ml" */ i***- \.Hptm*did uladatiwtutatia* and fey, Mask, wliu or. aaiMJdlU astats* iuwlartaa sad *< awt Onii. A multi-conductor wire (or fuel burner con vTCpsduie fire insurance and fine appearance in trols, safety pilot.a intercommunications and jjSjvur switchboards with flame ana heat resist* signal systems. Heatproof, fireproof insuktioo r*uit. Rockbeitoi A.V.C. Switchhonrd Wire. and steel armor give trouble-proof circuits. "Tibti right angle trendi without cracking '.leouw asbestos wall acts as a cushion beneath tmid, Rockbcstos A.V.C. Hinge and Switch* lord Bus eables have same characteristics.. RocxBErras a.v.c. boo volt tlcubie coro Sim* A'. 10 U It AII 'C wsU In* a* lit** tamtadan i`m laud mitS imprtfaalei Jdttd aAtdat, nxiili* eeailria, /dud atBadat. aaatrtd wui Sit r/Scsim Braid.' A heavy duly, high^lielectric. heal and mois ture resistant flexible cord used in locomotive cab circuits, high wattage lighting units, flood* lights and for lends on apparatus exposed to heal. Specify polarised conductor* if desired. Fur hign temperature applications where re- the fulMoad torque line is -sgitif1 sittance to moisture is not required specify reached, or until desired speed is ofrf tained, corresponding to the torque- onl the motor. This process is repented for) each succeeding step until the desired ^ IOCMBTOS A.V.C. SOO VOIT POWER CABU R0CR8CST0S MX. ROD-VOLT MOTOR UAD CASH (NsUofttl EVmd\Cod.Tm AVAJ t Sim Sa. IIA WO la IflOOJXJO CU iwwtlW t/i bw mAf rf imaftfamlU and a wmmm rawSrw otlk Lrafs seMOs* wsid dmfoU. All-Asbestos insulated constructions. Use this npparatui cpble for coil connection*, ( conditions are secured. In each case where a resistor is cut out of circuit/, the current inrush must be diecked to] ensure a safe percentage increase is, siWOu. rtwir'ir, ami aiUria* btaid. " '* maMrmtiuu fAr nrtim Mllofu AMD. motor and transformer leads extmscd to over-.' load* or high ambient temperatures. It makes AOCMSEXTOSALL-ASBESTOSBOO VOLTRREOBTAT CABU cable b recommended for power leads of j'.9f*twtpoed equipment and circuits tlial run a permanent'irtftalhition'4* *>l ii resistant U> heal, flante, oil, grease and moulurt. ^Mir boiler*,' steam line*, furnace*, kilns end, (Nsthmil UMttnctJ Cede. TjfM AIA) giw> AV It AWO u rfiOOMO CU iasdaUd v<U t TSJUSr'.......................... current. Milton N Kraus, Sunnylds,*i Long Island. gather hot spota, H withstands high ambient Vud conductor temperatures and has ample py 5e**^Ufe 'txislance. Use this cable for wiring rheostats, switch* ROCKBCSTOt lUtlTOS IMSUtfiTCD MACMCT WIRE fUi,*4<^"r>aa4nf*i,fs4traib<fc>F imn/bW rvmdmlnil boards, elevator and locomotive control panels > meat mrfiaa taitUiaf wadiliaru amd Mil I'M*- ijahri equipment exposed tn heat, fume* or fire* hssAra-- also (or open power circuits in hot, Rotor Current Calculated Protect-motors against heat*induced break*, dry-looitions. For flexible conductor specify. dnwn* with Clos* 1 winding* of best relliiig Hnckhestn* All-Ashestos Flexible Apparatus Values or STAivnrrc cur mint and re- j sistance that JHV wishes Jo determine mniptet wire. Ilockbeslns A.V.C. Motor Lead ML "WtBTOS A.V.C. CM VOIT CONTROL CABU Coble oompletes the failure-proofing. 3, i..TJ*.!* **"*1*dnrt will iaditidwall iatalaftd lit* Malar Cable -- tor solid conductor, Hockbestns All* Asbestos Uheostat Wire. ,, -- are governed <by (he torque and lotiMji r*; .during atartlng. By changing the jj i^vSLi trail* taaatU a*VoUrd wilt ** ntyrtai * dmadiwa, AWO N*. Jf-Jl/III 0,k,r *'*<*# " w*r. sistance in the rotor circuit, he esn ob-Mj I'f*22*ne^ fr applications-requiring a mulli- tain eny desired torque and speed. V ILVVaS*tlk--^l eonlrl vc*n'nhllee mcappaaobilce ao<f wwuithnsxtiaannad** hl|n temperatures, cortoiivc funwsi oil, which the mstor is capable of develop`d mi,blur.: ,-!t also eliminates. fire ing between standstill and full spe*4-] Swr11 WN* not burn. Used by equipment' ...-r-v ROCKBCSTOS PRODUCTS CORPORATION : 6B7 NICOU ST,, NEW HAVEN 4. CONN, NBW'-YOXK BUFFALO ' CLEVELAND DBTROtT CHICAGO PITTSBURGH ST. LOUIS LOS ANGELSS OAKLAND, CAL MM* nmAMUM. i<mI milla.. (Continued on page 148) POWER April A^'