The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

this area is practically exposed to ra- diation through the steel hull to the external air. The cabin is provided with a liberal supply of fresh air through a duct and 4 in. x 4 in. uptake, and the door is. arranged with the customary Venetian panel. The ventilation, therefore, is quite up to the standard} and for cer- tain reasons the incoming air is rarely or but slightly heated. For this par- ticular room the demand on the heat supply is therefore certainly as heavy as that of the ordinary promenade deck stateroom. The room is warmed by one of the regular electric heaters manufactured by the Consolidated Car Heating Co., of New York City, which consumes eight amperes at a pressure of 110 volts. For the purpose of observation the days were divided into two periods, viz.,.8 a. m. to 11 p,m, and 11p..m. to 8 a. m., which in the following data are referred to respectively as "Day" and "Night." (See chart, Fig. 1, Plate I.) During the day the temperature was kept at 69 degrees Fahr., and at night | at 64 degrees Fahr., by means of the Geissenger electro thermostat. The thermostat was arranged to operate on a switch which controlled the amount of current supplied to the electric heat- er aforementioned. In the circuit be- tween the said switch and the heater was placed a wattmeter, which record- ed accurately the amount of current consumed by the heater in keeping the room at the desired temperature. Careful records were taken of the wattmeter readings, as' well as the external temperature, and that of the incoming air for both day and night periods. All these data are plotted in the charts herewith, Fig. 1 being the graphical record of the east-bound trip, and Fig. 2 that of the west-bound trip. Summing up the observations taken the following results were obtained: "TAE MarRINE ReEvIEW With reference to the remarkable difference in power used in the, day and night periods, it should be stated that the consumption for the night is so much smaller than that for the day, because the actual time of observation is much shorter and, also, because the 41 coils, whereas the staterooms on the two upper decks are heated by electric heaters, consuming on an average 1,200 watts per hour each. These rooms being on the promenade decks are ven- tilated by means of ducts, one to each room, having an intake close under the Fig. i . " " VOYAGE N° {51 EAST, S.$ ST. PAUL NOV ES Eee ee Leo oe? eB 29 30, DEC 1907 ps0, UNEP EO oN SOA IN DN) Oo NI Boe ae eee ae -- eee RN a 2 at a an 80 SSIES S| SES ee ares a Pais Le Lagteaee ra Sh al soos : va a 70 a eters --<S[S----S 7 ---- : . Bees LS TEMP./OF RGOM 2 t "« 60 eel ees) S _|--o--}--o_| __, TEMP OF AiR FROM wi THERMO] TANK = ° nN wu 50 : fs os z ee : os : es | i Po EXITERNAL TEMP. 40 Rs os pete te Se aa oe WE ses 30 ee S lye | es \ @ 500 ieee) ° < os DAY CONSUMPTION cae x ee ' ae) Ls ia 20° : aa ae 4 = 4 ir oe ns PiRiatete < ee eerie ee sees 20° oa : iN 4 oo No NIGHT CONSUMPTION < és ay ef en! --_ --- ae Sg eI. to nae ieee cece ° | amount of heat required to raise the warmth of the room from the night temperature to the day temperature is comparatively large, and, naturally, it appears in the total reading for the day. The following observations conduct- ed recently on board the steamship Oceanic should be of interest to naval architects, showing, as they do, the average expenditure of electric energy of a typical and purely electrical sys- tem of heating, where the passenger has complete control of the heaters. The halls and public rooms of the vessel are heated by means of steam SUMMARY OF OBSERVATIONS. VOYAGE NO. 151, EAST, S. S. ST. PAUL, Average external temperature Net. consumption Total for trip Average temperature of incoming air ventilation. 64.3 deg. Actual consumption by Wattmeter......:....... Extra electrical energy consumed by lamps and resistance........... 9.8 0A 8 8 R68: P68 Sew a: 0s 68: 8 ew Rie a wee VOYAGE NO. 152, WEST, S. S. ST. PAUL, Average external temperature Average temperature of incoming air ventilation. 64.6 deg. Average Temperature OF TOON. ec s. ss 5 eee Actual consumption by Wattmeter............. Extra electrical energy in room consumed by lamps and resistance... Net consumption MOtaL, fOr AEDs oy ees acini. ane cy eiee ee eee eee eee ee ee eae Day. Night. Day. Night. 47.1 deg. 44.8 deg. 64.4 deg. se te ee ase 31,9 Kaw. 4.8 K. W. 19.0 K. W. 3.4 K. W. ee 40.9 K.W. 82K, W. beh ees Se 49.1 K. W. Day. Night. Day. Night. 45.5 deg. 44.7 deg. 64.8 deg. 69.0 deg. 64.9 deg. PS eae Ce naa 50.6 K. W. 7.1K. W. 9.5 K. W. 2.5 KK. W. aren ee ik Wo te kw, ee ee 69.7: K. We \ deck in the center of the outside alley- way or promenade, leading from thence into the side of the deck-house, down the side of stateroom behind the casing, and opening to the room through a ported slide, just behind the electric heater, which is placed un- der the sofa. The doors have solid panels, movable louvres being fitted at the top of the room between the beams and leading into the hallways. Through the courtesy of Mr. Blake, superintendent engineer of the White Star Line in Southampton, an accurate record was kept of the consumption of current used in heating the staterooms of this vessel during one round voy- age, Figs. 3 and 4 (Plate II.) being the graphic record of the west and east bound trips respectively. . Jt is worthy of note here that, though this ship was originally fitted with multiple circuit heaters and switches, giving medium, low and max- imum heat, it was found advisable to substitute simple heaters of maximum capacity, as the finer sized wires of a divided circuit heater frequently burnt out and gave trouble. It was also found that the average passenger did not possess -- sufficient mechanical knowledge to master the graduation of the switch, and was disposed to