ENGRAVINGS.. 



Vol. XXXII. Mr. Cleall's Maohir>i for thrashing Hemp; and Mr. 

 Bond's Machine for hreaking Hemp. — Mr. Ward's Compensation Pen- 

 dulum. — Mr. Groombridge's Diagram of the Motion of the Planet Vesta. 

 — A Portrait of Sir H. C. Englkpield. — Mr. Charles Lk Caan's 

 Tram-P!ates — and Mr. Collier's Ship Stove. — Apparatii.-! employed hjr 

 Mc>sis, Allkn and Pepys in their Experiments on Respiration. — Mr. 

 Hbnry's Apparatus for Decomposing Compound Inflammable Gases. — 

 Apparatus enip!oy<d in the Royal Institution for the Decompo.«ition »f 

 Potash by Iron. — Bell's Method of saving Shipwrecked Mariners. 



Vol. XXXllI. Mr. Jamf.s Elmes's Portuble Bridge. — Mr. Knioht's 

 new Method of training Fruit Trees. — Mr. Herschel's Figures of the 

 Comet of 1807. — Two Plates to illustrate Dr. William Richardson's 

 Paptr on the Basaltic S\arface of the Counties of Derry and Antrim : viz, 

 A View of PoRTMOON. —A View of Pleskin, on the N. VV. side of Ben- 

 gore Pronoontory. — Mr. Clegg's Apparatus for making Carbonated Hydro- 

 gen Gas from Pit-Coal. — Mr. Richardson's Machine for raising large 

 atones out of the Earth ; — and Mr. Gough's new Hygrometer.— Pi lton"* 

 Light Fence for Inclosures, which beoomes invisible at a short Distance. — 

 Proposed Improvements in Telescopes, by M. BuRCKHARDxand by Dr. 

 Brewster ; and M. Boullay's Apparatus for Phosphoric Ether. — Major 

 Le Hardy's Telegraph. — Capt. Bolton's improved Jury Mast; and Capt. 

 Ball's Method of Fishing Anchors.— Plan and Section of the Thames 

 Archway. — Plan of Stonyhurst Scientific Establishment. — Mr. Tad'.s Me- 

 thod of causlsg a Door to open over a Carpet; — and Mr, Barlow's Wrench 

 for Screw Nuts of any Size. 



ELIAS HALL, opposite the Inn, at Castleton, Derbyshire, Manu- 

 facturer of Ornaments of every Description, in Fluors and other Spars, 

 (usually called Petrifactions,) in Gypsum, Marble, &c., takes this oppor- 

 tunity of informing his Friends and the Public, particularly such as are 

 travelling the High Peak of Derbyshire, with a view to the Geological and 

 Scientific Information which that interesting and astonishing District is cal- 

 culated to afford, that he has a large Collection of Specimens of Native 

 Fossils of the Mineral Minerals and Toadstone Strata constantly on Sale; 

 as well of the Rocks, Spars, and Metallic Ores, as of the interesting orga- 

 nic Remains of the Animal Kingdom peculiar to these Strata: which Spe- 

 cimens being collected by himself, he will be able to point out to Collec- 

 tors, the local and relative Situation of each in the Stratitication of the 

 District. By a reference to a Model of the County of Derby, which Elias 

 Hall has executed, by Permission, agreeably to the Mineralogical Map 

 which Mr. John Farey of London is executing of the whole County of 

 Derby, he hopes to be able to explain tully to Scientific Gentlemen or 

 Ladies, who may do him the Honour to inspect his Factory and Collections, 

 or take him out with them in addition to the ordinary Guides, in their Ex- 

 cursions in the Neighbourhood, the Nature and Relations of every Par- 

 ticular worthy of Observation, respecting the Rocks, Caverns, Mines, 

 Stratification, Dislocation of the Strata and extraneous Fossils of the Di- 

 strict, according to the mor>t recent Discoveries on the Subject ; which, 

 from their Importance and Novelty, cannot iail of giving much Satisfaction 

 to the Curious. 



N.B. Orders for Ornaments punctuaHy executed, Wholesale or Retail, 

 and Ornaments repaired, clrancd, &c. 



