4G2 Report on the Trials (f Implements at Oxford. 
useful effect off tlie driving pulley of the horse genr was ascertained. As soon 
as the trial was finished with one-horse 
gear the drum was removed from it 
and placed upon another, which during 
the trial of the first had been fixed in 
its neighbourhood, and thus the experi- 
ments went on through three long days. 
That they were completed even in that 
time is due to the fact of Messrs. Aveling 
and Porter having afforded (in addition 
to the ordinary traction engine which 
drew the rope) the assistance of their 
valuable traction crane engine, the well- 
known "Little Tom". This engine, 
with its skilful juvenile driver, ran 
about the yard realising all the tales that 
one has ever heard of the power and 
of the intelligence of the elephant. It 
went in and out of places where there 
did not appear to be room for it. It 
turned in positions which seemed im- 
possible — it lifted all sorts of jjieces of 
machinery — carried them to their des- 
tination — set them down upon the 
ground ; or even in the case of the mill- 
stone trials, (which must not be described 
here, as they fell to the lot of the other 
Judges.) i)laced the running stone upon 
the bed stone; and, in the case of these 
horse gears. Little Tom jjicked up the 
gears, put them down irpon the ground, 
picked up the wooden drum from the 
gear that had been tried, placed it upon 
the gear that was to be tried, laid hold 
of the one the trial of which had just 
been completed, pulled it out of the 
ground, and ran away with it to the 
exhibitor's stand. 
It is really difficult to speak too highly 
in praise of the utility of this engine 
of Messrs. Aveling and Porter, and it is 
impossible to speak too highly of the 
unremitting exertions of Mr. Aveling, 
and of all those engaged under him, in 
aiding us in carrying out the horse gear 
trials. 
In "mere justice, we must also ac- 
knowledge most gratefully the valuable 
assistance we received from I\Ir. Amos, 
jun., who presided over the friction 
break with imflagging zeal, and worked 
out many of the results, and but for 
whose devotion these experiments could 
not have been so successfully carried 
out, if, indeed, they could have been completed at all. 
Although the relation between the useful effect developed and the power 
