44y

R^gdom.]

AND SURGICAL INSTRUMENTS.

North, North Central, and South Central Galleries.

^41 Marriott, M., Montpelier Square —Inventor.Ralance for chemical analysis; the beam, made of pine,jaghs less than one-third of an ounce; when loaded with>000 grains in each scale it will turn with the 5 J 5 th of aferam, and with the ^th of a grain when light.

’ 4-2 Ross, William, Strathsteven, Golspie, Sutherland —Inventor.

Graduator. An instrument for the approximate deter-, ln ati°n of the heights and distances of objects, in miles,ams, yards, or feet, as found by reference to tablesdapted for its use; it also shows the time of day by theUl1 in any part of the globe.

^43 William, Barton Hugh, Waterfoot, Ireland .in^tL instrument designed to take angles and bearings® e id, and transfer them mechanically to paper,hout reading off.

att l S instrument consists of two rulers, with sightsc ‘ached to each. These rulers turn on a pivot, and at IdPass is fixed in the lower valve. It is designed toangles and bearings in the field, and transfer them

I a • Really to paper without reading off. It is particu-tefl ^tended to take the place of Sir Howard Douglas’spr ec *' u S instrument, and Schmalcalder’s compass and

II trac t 0 r, the offices of all three of which instruments it

takes to perform.

bility of metal. Owing to the extreme minuteness of thedivisions on instruments divided to 10 seconds, the diffi-culty of reading them off is great. This is obviatedby the use of ivory, as a black mark on a white groundpresents a much greater contrast than a self-colouredmark on metal.

Improved action magnifier. In other instruments, themagnifier placed to facilitate the reading off the divisionsmoving in a smaller circle than the arch, distorts thedivisions upon approaching the extremity of the vernier,by their being thrown out of the centre of the lens. Thisis avoided by the present plan.

Improved spring hollow leg, thus to avoid the possi-bility of altering the adjustments of the instrument inplacing it down.

Improved ivory arch metal quadrant, possessing, inrespect to the ivory, the qualifications of the before-men-tioned sextant: the ivory being dovetailed into the metal,cannot come out or shrink.

352 Williams, William, 57 Johnson Street, Somers Town■—Inventor and Manufacturer.

A radiator, or instrument for artists, designers, ordraughtsmen, to enable them to draw lines radiatingfrom a centre.

353 Adcock, John, 4 Marlborough Road, Dalston —Inventor.

^^4 Dover, John, 14 Little New Street —Producer,tvith Cate balance contained in mahogany lantern case,..j ’"'eights packed in a drawer for chemical analysisntl assaying.

3 46

iR^i vei, sal spirit level, adapted for levelling all kinds of

Dobbs, George, 37 St. Alban's Street , Lambeth —Inventor,

* Cox, George, 5 Barbican —Manufacturer,eq. Portable instrument for ascertaining correct time byPiec a ^titudes of the sun, and intended for rating time-Th S ’ etches, and chronometers.st U( i “periphan,” an instrument for facilitating thet 0 gastronomy and astronomical geography; intendedby X P* a * n many phenomena which cannot be illustratedR e COInmon globe.

trip 0 ? m draining-level, with adjusting parallel plates onlaii^r stand, giving by inspection the rise and fall ofling ‘“tended to be drained; useful in laying tiles, level-r pj l ail u building operations.

plat„„ e A'level for the above purposes, without parallelor tripod stand.

Hardy, James, 5 Wellington Road, St. John’s Wood—Inventor.

any ob r .°5 r aph, an instrument to enable a person to drawJ e ct from nature, by actual measurement.

Model of a new machine for measuring and mappingroads, &c., on the scale of 1-J inch to a foot. In its usethe slightest tendency to error from accidental displace-ment, an unevenness of the road, &c., can easily bedetected by placing a compass upon one of the rightlines of the map, which will enable the least deviationfrom the original or starting position to be at onceperceived.

354 Brake, R., Glastonbury, Somersetshire —

Inventor.

Model of an instrument for explaining solar and lunarphenomena. Its novelty consists in the means adoptedfor showing the daily increase or decrease of the sun’sdeclination, for explaining the nature of eclipses and thecauses of the harvest-moon, and of the difference betweentrue and apparent time. There are two small appendages,one for measuring the sun’s altitude, and the other fordescribing his apparent diurnal motion in the ecliptic, andfor showing the angle which, at any particular time, thelatter makes with the horizon. The model (six inches indiameter) is complete, but only about one-third the proposedsize of the instrument.

355 Graham, John, High Sow, Darlington, Durham —Inventor.

A rule for showing the circumference of a circle whenthe diameter is given, and vice versa; and for showingalso the side of the square equal in area to a circle whosediameter or circumference is given.

3 40 d

Garrett, Robert M„ 4 Jamaica Terrace,Limehnuse —Manufacturer.

fac ilitv^ V ' e< * * unar sextants. Their object is increasebra Ss ' 111 wading off by night. Plain sextant. Improvequadrant, divided to half minutes.

Se 1 AYLor , Janet, 104 Minories —Manufacturer.heaven? 111 ' bir measuring angular distances between thUJ y bodies.

i,

g n EATH, George, Erith, Kent —Manufacturer.S ° c °ndq ^ell-metal ivory arched sextant, divided to lis > combining the clearness of ivory with the dura

356 Cameron, Paul, 87 Lotidon Street, Glasgow —Inventor.

Azimuth compass, adapted to solve various problemsin nautical astronomy, practical navigation, and civilengineering.

Engineer’s improved indicating level.

Mathematical and nautical slide rule, for the use ofengineers and naval officers.

Improved thermometer, steam and vacuum gauge.

357 Macdonald, Dr., 4 Coburg Place, UpperKenningtanLane —Inventor.

Instrument to facilitate the finding of the longitude atsea.

[ 10 .]

[Official Illustrated Catalogue.]

2 K