Barometers, from 1l. 1s. to 1 16 0 Ditto & Thermometer, in one frame, from 1. 11s. 6d. to 2 12 6 Barometer, Thermometer, and Hydrometer, all in } one frame, from 2l 12s. 6d. to } 3 13 6 Farenheit’s Thermometers, in mahogany cases, } from 1l. 5s. to } 1 11 6 Pocket ditto, in black cases, from 12s. to 1 1 0 Spirit Thermometers, on box scales, for hot-houses 0 10 6 Hydrometers, in Ivory, from 4s. to 0 5 6 Ditto, in copper, with weights, _&c._ for } proving Spirits, from 1l. 1s. to } 1 5 0 Hydrostatic Balance, with apparatus, _&c._ 1 15 0 Speaking Trumpets, from 10s. to 1 11 6 Hearing ditto, from 7s. 6d. to 1 1 0 Reflecting Telescopes, from 1l. 16s. to 50 0 0 Refracting ditto, of various lengths, with four or } six glasses, from 7s. 6d. to } 6 6 0 Double reflecting Microscopes, from 3l. 13s. 6d. to 7 7 0 Solar ditto, in Brass, from 4l. 4s. to 6 6 0 Wilson’s pocket ditto, from 1l. 5s. to 2 12 6 Opake ditto, from 2l. 12s. 6d. to 3 13 6 Cloth ditto, from 3s. 6d. to 0 7 6 Flower ditto, from 3s. 6d. to 0 5 0 Diagonal Machines for viewing prints, from 16s. to 1 11 6 Large Book Camera Obscura, from 4l. 4s. to 5 5 0 Box Camera Obscura, from 10s. 6d. to 2 2 0 Scioptric Ball and Socket, in Wood 0 7 6 Opera Glasses, from 5s. to 2 12 6 Prospect ditto, from 8d. to 0 10 6 Magic Lanthorn, without objects, from 1l. 1s. to 1 7 0 Magic Lanthorn sliders, with objects, from 5s. to 0 10 6 Mirrors, convex or concave, of all sizes, in black } frames, from 10s. 6d. to } 16 16 0 Prisms, from 6s. to 1 1 0 Reading Glasses set in a variety of curious } frames, from 2s. 6d. to } 2 12 6 Watchmaker’s Glasses, in frames, from 1s. to 0 10 6 Concave ditto, for short sighted persons, } from 1s.6d. to } 2 2 0 Spectacles ground on brass tools, and set in } silver, tortoise shell, horn, } _&c._ from 1s. to } 1 7 0 Achromatic, Opera, and Prospect glasses, } from 1l.