Kingdom.]

AND SURGICAL INSTRUMENTS.

Noeth, Nokth Central, and Sooth Central Galleries.

407

. On both sides, at one-fourth and three-fourths of theare brass plates, with holes for receiving the screwnieh clamps the plate of the tripod-stand (technicallyailed a camel) to the box, for the purpose of adjustinge bar in a longitudinal direction. The compensation, ars ai 'e six in number; the weight of each bar, with its' f ° brass ends, is 136 lbs.

description of Compensation Microscope. —2. The eompen-tjf 1011 . microscope consists of three microscopes, placedof if ’ nc ^ es from centre to centre, connected by two barsW and iron, 7 inches long, 0‘6 inch broad, and, fro inch thick, 2 • 5 inches apart, firmly secured togethery means of a brass collar and cylinder, forming part ofo tube of the centre or telescopic microscope.

I he two bars, carrying with them the outer micro-bes, of two inches focal distance, being free to expandr °m, and contract towards, the central microscope, inde-pendently of each other; and thereby forming with itm^l angles of inclination similar to the steel tongues of,ne compensation bars. The compensated point of eachs s « adjusted as to be in the outer focus of its object| la ss. The microscopes revolve on the axis of the tele-Popic microscope in a tube fastened to a horizontal platettaehed to a tripod-stand with levelling screws, and fur-o 'shed with longitudinal and lateral adjusting screws. Onside, secured to the brass bar, is the spirit-level, fort Ve 'hng the microscopes, and on the other, firmly fixedthe centres of the bars by a brass plate, is a telescope,.mbraced by a brass collar, with a small cylinder pro-J cting from one side, which turns in a socket attached to0 >? Plate; thus affording it a vertical motion, allowingJccts to be seen in opposite directions. The telescopici 'croscppg j s provided with an adjusting screw, for alter-S the focal distance within certain limits, as well asu. Vea ble object glasses of different focal lengths fittingjp the lower end of the tube. The compensation,-Proscopes are seven in number, the weight of eachbein g 7 lbs.

y J-All the methods adopted in the measurement of basees m trigonometrical surveys which had been in usej. Q evi °us to the survey of freland, depended more or less0 j, r 'heir accuracy on the knowledge of the temperatureIbe bars, &c., used in measuring; but as the timeP'Ph substances occupy in heating or coolingis dependent®Pon their nature, mass, &e., it did not appear that anyPPhcation of thermometers would give the true temper-of a bar throughout its whole length, particularlyPen the temperature of the air itself was undergoingCon stant change.

* nis circumstance led to the application of the prin-dev' 6 - 0 ^ com P ensat l on use< l ' n gridiron pendulums, toising an apparatus for measuring a base line. Asfac ^ aVe ^*fr erent capacities for heat, and their sur-es have different powers of radiation, experimentsin tb ma< ^ e t0 equalize the effects of varying temperature^ ar Pe brass and iron bars; and for this purpose the brassWere bronzed and varnished, and the iron bars werelacquered, and smoked, and the amount ofCesa ?A>lack so produced was gradually removed, on suc-v e experiments, till the desired effect was obtained.J - G.]

Airey, Thomas, 67 Dale Street, Liverpool .

Secon,? centre seconds with compound independents > and only one train of wheels.

V ®itch, James, 6 Ovington Square, Brampton —

^ . Inventor.

' Ju lane lnV r nt ' on ^ enom i na t el l the medico-chirurgical am-°Perat; 6 ’ * or sur gi ca l use on the field of battle, with an3 f eet “8 table attached thereto. The solid structure is,h <*e i s 2 ,feet in breadth, to which

s affixed an inclined plane to raise the shoulders

when required. The flap is 2 feet 6 inches in length,and of the same breadth as the solid structure, and issupported when necessary by a moveable beam that canbe promptly projected from under the table, which is2 feet 11 inches in height. Under the body of the tableand in the centre there is a square box of 16 inches in alldirections, with 4 exterior and lateral divisions of 2 inchesin breadth each, 16 inches in length, and 8 in depth, forreceiving the cases of amputating, trepanning, miscel-laneous, and cupping instruments, and they are exteriorlyso marked. When amputation of the thigh, or any otherextremity is required, the necessary instruments are laidout on the inside of the cover of the box just adverted to,beginning with the letter nearest to the limb to be re-moved, the first instrument wanted to be placed oppositeA, and the second opposite 14, and so on, according tothe order in which they are required during the operation.If a shoulder is to be removed, the same arrangementsare to be adopted as in the amputation of a thigh, withthe difference of placing the instruments at the headinstead of the lower extremity of the table. The divi-sions in the centre are intended to receive bandages of 6,of 5, of 4, and 3 yards in length, and 3 inches in breadth,and they are capable of giving accommodation to 200 ofthe description noticed. The drawers in front markedligatures are intended to keep these essential agents ofsurgery in constant readiness. The drawers marked slipsof adhesive plaister indicate the propriety of their beingat all times in readiness for operations and wounds. Thecompartment marked fractures is for keeping the splintsand bandages necessary for the treatment of such acci-dents. The department marked dislocations indicatesthat all instruments required for the reduction of suchdislocations are there to be found.

7 Hutton, John, 9 Lucas Place, Commercial Road East—Inventor and Manufacturer.

Lady’s gold watch, with patent single compensationstud. Gold watch, and silver lever and silver hunting-watches, with the same improvement.

Clock, with patent compensation pendulum and baro-metric contrivance, to prevent the variation of rate arisingfrom the changes in the density of the atmosphere.

Marine chronometer, with patent pneumatic auxiliarycompensation,’ for obviating errors in extremes of temper-atures; this is effected by means of a metallic thermo-meter, which varies the air space in which the balanceoscillates.

Gold first class watch (called Hutton’s patent leverchronometer).

Patent lever escapement, showing the parts separately.

Silver pocket chronometer, with improved adjustments.

Gold first class watch, with patent escapement andspiral spring.

Gold watch, with patent double compensation spring,stud and patent escapement; adapted for riding, &c.

8 Cragg, John, 8 Northampton Square, Clerkenwell—Manufacturer.

Varieties of gold and silver watches, and a model oflever movement.

9 Yates, Thomas, Preston —Inventor, Patentee,and. Manufacturer.

Patent clock, on the detached dead-beat principle.The wheel-work is so arranged that each vibration of thebalance measures half a second, while in the ordinarydetached lever each vibration measures a quarter of asecond. The teeth of the escape-wheel are not so muchundercut as in the ordinary lever. The pallets from thepoint of rest are drawn a complete circle to the escape-wheel teeth / so thnt "when the b&ltince returns und unlocksthe escapement, there is no recoil. This escapement willcarry a heavier balance with less motive power, and con-sequently will require a stronger balance-spring.

Gold watch, beating dead half-seconds.