Twelve-inch Portable Achromatic Telescope, German Silver.

mical Eye-pieces

Thirty-six-inch Achromatic Telescope, on Stand, with Astrono

Forty-five-inch ditto, ditto ditto, 2 aperture

Ditto ditto ditto, 3 aperture

Ditto ditto ditto, 4-in. aperture

Powerful Double Race or Reconnoitring Glass much used

15s. to

1 11 6

21s. to

2 2 0

42s. to

84s. to

8 8 0

1 11 6

220

2 12 6

Night Telescope

Gardner's Microscope

Compound ditto

4 14 6

040

1 1 0

Telescopes made of all sizes. Opera Glasses, mounted in Buffalo,
Horn, Ivory, Tortoiseshell, Pearl, &c., in every variety and
fashion.

Magic Lanterns and Dissolving Views of great variety.
Spectacles, mounted in Gold, Silver, Steel, and Shell, with Glasses,
Pebbles, or Chamblant Glasses, which are highly approved of
for Spectacles, Reading Glasses, &c., as they overcome all
spherical aberration.

OPTICIANS TO THE OPHTHALMIC HOSPITAL.

Air Pumps, Electrifying Machines, and all other Philosophical Apparatus

Photographic Lenses, mounted with rack, quarter plate

5 15 6

Complete Sets of Photographic Apparatus, with Camera, for

Drawing Paper, plain and mounted-Tracing Paper-Colours— Globes-Drawing Boards Curves - Black Mirrors-Camera LucidasStands for ditto-Camera Obscura-Walking Sticks with Rods.

Universal, Horizontal, and Ring Sundials-Models of Diamonds— ELLIOTT'S Drawing Pencils-Water Colours, &c.

Treatise on Slide Rule, by Rev. W. ELLIOTT, 1s.-BEARDMORE'S Hydraulic and Tide Tables, 2nd Edition, 10s.-Description of Mathematical and other Instruments by Mr. HEATHER, 1s.-The Practice of Engineering Field-Work applied to Land, Hydrographic, and Hydraulic Surveying and Levelling, by W. DAVIS HASKOLL, C.E., price £1.

Popular Sketch of Electro-Magnetism, 1s. 6d. Popular Chemistry, 18. 6d. Illustrated Catalogue of Optical, Philosophical, and Mathematical Instruments, 1s. 6d.