28 The Philippine Journal of Science 1922 
TABLE 10.—Determination of the rate of evaporation of ammonia from a 
Natalite mixture exposed to the air. Temperature, 28° C, 
0.1 N hydro- 
| 7 ed Cae | bom 
Duration of exposure to air. / ia boas saietaeas ammonia. 
mixture. 
Mins. ec. mgs, Per cent, 
i LoS SS SO Se Pewee Sim eae ators tS Sgety Mine une Oe Reread 4.3 EA eeseeye geen ct 
see a ec oe ee de oe er euuo cunt wee uuicanues 3.7 25.2 14.0 
PU cUeakc GinUka boo Oag skews nes Sa oa eee kc cece ee Sacekk 3.3 22.5 23.0 
UG ie ee a ae ee 2.3 15.7 46.4 
Wicked cg eiesmu ee Ge Le ee oe eee ee ee Ss 1.3 8.9 69.6 
PU eet poe don cee ee uatenaceecea suck pesieces tens occe 0.2 1.4 95.2 
SAU ae oc ene sae Se See bs te vow oteue cus 0.0 0.0 100.0 
TABLE 11.—Comparison of Shell gasoline with Natalite and with Foster's 
motor alcohol. 
Shell gasoline. | Natalite, _| Foster's motor 
MARGE DOF Gallons ics ec 13.6 11.9 12.0 
AOE BOD ood eee ice nceweecasccotonee Mobiloil Arctic.| Mobiloil Arctic.| Mobiloil Arctic. 
Ease of start from the cold _________._____- Must be choked_| Starts readily __| Starts readily. 
Knocking under strain___.............-__-. PNG ssh None sos None. 
Btehe (sctsiud cele o pes Gotd . oro Geode Good. 
Carbon formation in the combustion 
Chamber 255 So ee Marked. 2s) Slight 5.22.52: Slight. 
Condition of spark plugs_-_-._.-__-.._.___. Sootedi.5 so. Clea ccc Clean. 
Trouble was experienced at first due to clogging of the car- 
buretor from dirt loosened by the motor alcohol. After a 
thorough cleansing of storage tank, vacuum tank, and carburetor, 
no further trouble was experienced. 
If this fuel is to be successfully launched in the Philippine 
Islands it will be only the part of wisdom to insist upon a thor- 
ough preliminary cleansing of the gasoline system and a proper 
adjustment to both the fuel-air mixture and the spark. The 
normal setting of the spark for gasoline engines is 20 to 15° 
ahead of “dead center.” The rate of explosion of alcohol fuel 
is less than that of gasoline and, consequently, the spark should 
be set at 25 to 30° ahead of dead center; or a safe rule to 
follow would be to double the advance recommended by the 
makers for gasoline. 
A lesson should be learned from Cuba’s experience with motor 
alcohol.” 
“Tillery, R. G., Louisiana Planter & Sugar Man. 67 (1921) 429. 
