92 Miscellaneous Implements Exhibited at Park lioyal. 
are automatically brought down to touch the lower ones, and 
then drawn upwards or apart, the result being an electric flame 
between the electrode ends from three to eight inches long, as 
desired. The flame or arc is produced by breaking the circuit 
from a dynamo through an inductance, the length of the arc 
varying with the amount of inductance in the circuit. A point 
which struck me most was the short time it took for the 
induction coil to “ build.” 
Article 3546. — Messrs. Wallis & Steevens , Ltd., Basingstoke, 
Hants. — This exhibit was a 5-ton trolley fitted with the 
“Wallis” Patent Backing Gear. 
On reference to the drawing (Fig 6), (a) is the framework 
of the trolley ; (b) is the framework of the forecarriage ; (C) 
is the steerage pipe which has a screw revolving inside it to 
move the runner (d) from side to side by means of the handles 
(e) ; a drawplate (f) is attached to the forecarriage pin (g), and 
is held in position by means of the pin (h), and is supported by 
the angle bar (i). To steer the trolley backwards, the pin (h) 
is taken out and the runner (d) is turned round to engage into 
the casting (j) by means of the handle (K), the pin (l) being 
pulled outwards to allow the handle and pipe to turn in its 
bearings. When this has been done the trolley can be pushed 
back by the drawplate (f). and steered. by means of the handles 
(E) actuating the runner (d). 
The simplicity of this backing gear is therefore quite 
apparent. By simply taking out the pin (h), releasing the 
pin (l), and turning the handle (E) round a quarter of a circle, 
the drawbar plate is released and the steering gear is put into 
action ; also by reversing these movements the forecarriage and 
the steering gear are thrown out of action. 
In concluding this short Report, I should like to take the 
opportunity, on behalf of my colleague, Mr. Mair-Rumley, and 
myself, of recording our best thanks to the Stewards of 
Implements, Mr. R. Neville Grenville, Mr. W. A. Prout, and 
Captain W. S. B. Levett, for the valuable assistance they gave 
rfS on our tour of inspection ; also to Mr. F. S. Courtney, our 
adviser as to points of engineering. 
Bayntun Hippisley. 
St on Easton Park, 
Nr. Bath. 
