You have heretofore furnished me with spectacles as reduced in their size as to give facility to the looking over their top without moving them. this is a great convenience; but the reduction has not been sufficient to do it compleatly. I therefore send you a drawing No. 1. so much reduced in breadth as to give this convenience compleatly, & yet leave field enough for any purpose: & I will thank you for a pair of spring frames made accurately to the drawing, and a set of glasses as mentioned in the same paper.

Those who are obliged to use spectacles know what a convenience it would be to have different magnifiers in the same frame. Dr. Franklin tried this by semicircular glasses joined horizontally, the upper & lower semicircles of different powers, which he told me answered perfectly. I wish to try it, & therefore send you a drawing No. 2. agreeably to which, exactly, I will ask another pair of spring frames to be made, & a compleat set of semicircular glasses as mentioned in the paper. these will of necessity give up in part the other convenience of looking over them. with these glasses I will pray you to send me a pair of goggles with clear glass, and a little case of three magnifiers of different powers GRAPHIC IN MANUSCRIPT shutting up in a single horn case. they are used chiefly for reading off the fine divisions of astronomical or geometrical instruments, & are commonly to be had in the shops. the drawing in the margin gives an idea of the thing when all the 3. magnifiers are out. I presume these particles placed between two pasteboards may come safely by post. the amount shall be remitted you as soon as known. Accept my salutations & best wishes.