-RATT] BRIQUETTING TESTS. 145 
)f lime, and for this relatively more lime is needed than when used 
with rosin alone. The best combination obtained was 6 parts of rosin to 
^ parts of slacked lime to 2 parts of the petroleum, P2. With Kansas 
•rude oil no positive results could be obtained. Six parts of rosin, 3 
)f lime, and 4 of the Kansas oil, P3, gave a greasy granular mass 
without any apparent binding- properties. With 3 parts of oil instead 
)f 4 a sticky mass was obtained, which, however, had no strength. 
PETROLEUM. 
All the crude oils and petroleums can be stiffened to some extent by 
nixing with rosin or hard pitch. None of the petroleums and oils that 
lave been tested, however, could be used alone in briquetting any of 
ihe coals. Most of them were too fluid and had little or no binding 
malities. 
MOLASSES. 
The molasses experimented with in the laboratory was that which 
an be bought in any market. In using the thick molasses it was 
ound advantageous to dilute it with twice its weight of water, and 
he lime was slacked to a paste with twice its weight of water. When 
hese two reagents were mixed together they had no apparent reaction 
ntil dried out. Using 1 part of water to 1 of molasses and 2 of lime, 
here was no apparent excess of either, and the mixture set at once to 
rather - hard cement, similar to plaster of Paris. A series of exped- 
ients was made with Arkansas coal, which showed that 5 parts of 
lolasses to 1 of lime would give the best results. 
WAX TAILINGS. 
A sample of wax tailings was received from the Standard Oil Com- 
any, which was tested with Arkansas coal. With 2 per cent of wax 
here was no coherence between this and the coal under moderate pres- 
ure. With 4 per cent, either hot or cold, an elastic briquette was 
btained which was fairly clean, but yielded under pressure applied 
owly. These briquettes were burned in a scoritier placed in a muffle, 
nd they seemed to burn perfectly. With pressure a briquette with 4 
er cent was obtained which had no greater strength than the other, 
ut was very smooth and clean. With 5 per cent of the wax and with 
ght pressure a briquette was obtained that was rather stick}^ and there 
as undoubtedly an excess of wax, as was indicated by its sticking to 
le plunger. 
The wax was also tried with some of the harder pitches. With 1 per 
3nt of wax and 3 per cent of pitch X a briquette was obtained that 
jad no coherence whatever. With 1 per cent of wax and 5 per cent 
Bull. 261—05 10 
