
          I will give you a description of the stop-cock
I propose, and for which I have the castings ready,
but have not [crossed out: ?] had sufficant leisure to finish
it. Perhaps you can tell me at a glance whether
it will be good for anything or not!

Fig. 1   Fig. 2  Fig. 3  Fig. 4
[four mechanical drawings showing a proposed stopcock valve assemblage]

Let a b be a solid piece of brass 2 inches
square and 1 3/8 inch thick, and in the side
drill a hole 7/8 inch in diameter to a sufficant
depth to hold a [card?] steel screw with firmness
[added: and let it be] conical at bottom as at d. Let a [?] steel screw
as xy (right hand figure) be fitted to this internal
[screw?] with a firm shoulder to [?] upon the solid
piece of brass at f e fig 1; in this screw drill another
hold to [?] the screw o fig. 2 with its inverted
cone at bottom. If  [insert: ?] every part, is properly constructed
we may saw the part o, fig. 2, into x y, fig. 4,
and this shoulder will come against the lower extremity
at y which is supposed to be accurately polished, and it will 
be as represented in fig. 2; and to the top y of the
[?] o may be fitted at thumb-piece m. The
        