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them quite distinct from the instrument we are about to 
describe, and which will, we believe, serve to account for the 
fact of these projects remaining as such, or never at least pass- 
ing from the first to a more perfect stage of development. 
These features are, 
1. The instrument was placed upon a large table upon 
which the pivot was fixed and upon which the plateholders 
rolled, the motion of the supporting rollers describing com- 
plicated curves upon the table, which curves Mr. Sutton 
recognised as being evolutes of the circle of rotation. 
2. No direct mechanical means were employed for effecting 
the relative motion of the plate and lens, guide curves formed 
by trial or less efficient means being alone used. 
1 believe I may state without fear of contradiction that up 
to the year 1862 no views produced by any of the inventions 
alluded to had been publicl) shown, nor views by any similar 
instrument purporting to produce pictures on true panoramic 
projection by continuous motion. Several tolerably success- 
ful attempts had been made to place two or more views side 
by side upon the same plate by means of a shifting back. 
But these compound pictures are merely views in plane per- 
spective placed side by side upon the sides of a polygonal 
prism, and have no pretensions to be considered views in 
panoramic or any other correct projection. 
It was not until the year 1862 that I succeeded in taking 
panoramic views with any degree of success. I had been 
employed in devising plans for effecting this object since 1860, 
aided by a working mechanic, Mr. Harrison. 
After passing over the same ground as some of the gentle- 
men above referred to without being aware of their labours, I 
succeeded in 1862 in perceiving that the complicated motion 
of the plate and lens might be really resolved into two simple 
rtiovements, a circular motion of the whole apparatus, and a 
rectilinear motion of the plate ; and that if the motion of the 
