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ENGRAVING FROM WYTHES (1856)FRONTISPIECE WITH ACTUAL ACCESSORIES SUPERIMPOSED
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The accessories are listed and labelled as in Wythes' description and his frontispiece:
Milled head moving body by rack and pinion
Milled head for slow motion delicate adjustment of focus
Sliding tube for varying its length
, d', d'' three sliding Huygenian eyepieces of successive powers
, e' milled heads for the rackwork motion to the stage
Stage plate with sliding and revolving motions
Ledge on stage for resting object-slips upon
Sliding piece on stage with springs for clamping object-slips
Upright rod fixed on this plane for mounting the forceps or spring-holder when a glass trough is used
Spring-holder for trough
Large double-mirror, concave on one side and plane on the other
Cylindrical bar which supports the mirror which may be moved up and down and sideways
Moveable diaphragm fixed under the stage for varying the quantity and direction of the light when transparent objects are viewed
Illuminating lens for condesning light upon opaque objects
, o', o'' Three lieberkuhns adapted to the object glasses, 2,3, and 4, are applied by sliding them in front of each respectively. When one of these is used the diaphragm is to be removed and the dovetailed piece p may be slid in its place with one of the three darkwells or stops
Dovetailed piece for one of three darkwells, p, p', p''
Circular disc for opaque objects used in place of darkwells
Bulls-eye lens for increasing the illumination
Livebox for observing objects between two glass plates; s'=Livebox with screw collar for observing objects in water, the screw is for regulating the depth of the water and the degree of pressure employed
Glass plate with ledge has a separate piece of thin glass to lie upon it for viewing animalcules &c. in water
u: Glass trough, u'= Profile of glass trough with its diagonal plate of glass for confining an object
Stage forceps
Camera lucida has its prism fixed on a short tube with a slight side motion for adjustment, and fits on each eyepiece when its cap is removed
Achromatic condenser which slides into place of the diaphragm to give the utmost refinement to the illumination of transparent objects
Erecting glasses, which when employed are to be screwed into the other end of the sliding tube
Three-pronged forceps
The object glasses comprise four powers of which No 3 and No 4 have the tube of their front lens moveable for adjusting their performance with objects either uncovered or covered with thin glass. The graduated screw collar, by which the adjustment is made is seen at 5