Patents connected with the Microscope. By W. H. Brown. 267 
direct rays proceeding from any object in any direction agreeing with 
the laws of perspective that are transmitted through from any point 
of an object in a direct line with the incident ray, which direct rays 
alone are proper for distinct vision, proves that all rays of light that are 
refracted are not only become distorted, prismatick, and are enemies to 
but likewise useless for distinct vision, being repugnant to that truth. 
To obviate the defects of optical instruments which refracted light 
occasions, I have the extream edges of the two surfaces of my syllepsis 
glasses truly paralel to each other, which when truly centered I cut 
off the prism from the glass, leaving only such part of the centre of 
the glass as jnay be proper for a sufficient quantity of those rays of 
light to be transmitted through as will be on direct lines with the 
incident rays, according to the distance of the object or the image of 
the object and the magnifying power required, preserving the laws of 
perspective (videlicet) a straight line with the incident ray, and this 
strictly to be observed by light transmitted through every or any 
optick glass according to the instrument used to or the effect desired 
of it ; I shut out all refracted light that I possibly can, considering it 
imperfect and improper for distinct vision.” 
“ A syllepsis glass is one optick glass, and which fully answers the- 
end and effect of but is far superior to the late improved accromatic 
object glass, exhibiting by its external shape or form such as when 
one convex and one concave or two convex’s and one concave are 
placed close together, which is in effect and form but one syllepsis glass 
with the prism cut off.” 
On examining the Catalogue of the Library of the British Museum 
I found that Storer published a work entitled : — 
“ Storer’s Syllabus, to a course of Optical Experiments, on the 
Syllepsis Optica, or the new optical principles of the Royal Delineator 
analysed (4to, London, 1782.) 
Storer appears to have had a committee to examine his invention, 
and made the experiments before them which he records in his book. 
I regret I have not been able to find out wdiat conclusions the com- 
mittee arrived at. 
On page 18 he says : — 
“ The following is a copy of a description of the Royal Patent 
Delineator, wrote by that high and justly distinguished 'noble 
character, as judge and patron of the Arts, the Honourable Horace 
Walpole, and from whom I had the honour to receive it, to present 
to Sir Joshua lleynolds to correct, who was pleased to return it me, 
saying, it appeared to him to want no alteration. 
4 THE DELINEATOR, an Instrument that obviates the defects 
of the Camera Obscura, as it does not require the Sun to shine on the 
objects represented, as it represents the objects erect, and neither 
inverted nor transversed ; as it is equally fit to be used by candle light as- 
by day light ; as it delineates . . . with the nicest precision. . . . 
The idea first occurred to the inventor, William Storer, of Saham 
