FRS

TITE

ACRICULTURAL MAGAZINE.

=> I Mn Cd No. LIL] NOVEMBER, 1803.[VorL. IX. Hou.

DESCRIPTION OF AN IMPROVED PFDOMETER. WITH A PLATE ANNEXED.|

HIS usefal ipstrument in mensuration, although of great utility, has been invented nearly ten yearepand/s at this day very little known. wan

The“following deseription is given“ of it'by the inventor, which we hope will Sufliciently illustrate the plate introduced into this number."»

A. The stock of the Pedometer.+

B, B, B,&c. Twelve spokes, one end of each inserted in the Stock, and the other tastened with a Screw(Oo the outward ring or periphery of the wheel.

C. Periphery, an iron ring 163 feet, or one poles in eircum- ference, adapted to Gunter!'s concise method of-anthmewtcK, and divided into 25 equal parts, corresponing to the links of his chain for land measuring,&c-.

D,D,D,&c. Twelve small plates, denoting the Separate Spokes, each including two links ofthe chain above mentioned.

N. B. The twelfth spoke is divided at its foot for taking in the odd or 25th link.- s pr?

E. An iron axis, being a Screw with 320 circumyvolutions, Separately marked on an engraved index on one of its Sides.=- In its application, it is Screwed fast into the Stock of the wheel, and when at work revolves with it.

F. A style or alidade, being an expanding Screw-nut, em- bracingthe axis and Screwing aloug it, as the latter revolves with the wheel, and as each revolution of the wheel when rollivg on the surface, describes an exact longitudinal pole, and con- Sequently four of them a chain, the Style hanging pendant and moving to its proper figure, denotes the length of ground passed over as divided into chains and poles on higindex of

the axis E, and links on th& periphery C.'

G. A Small adjusting Screw, by turning which the Style may be instantaneous|y moved back to the beginning of the index, when, in land measuring, the given line has been ascertained in chains, inks,&c. il

H. A cross orsquare with Sights for determining in land mea- Suring the perpendiculars, Suspended at its ends on the axis and occasionally to be detached therefrom when used with a touch only of the finger and thumb. Itfurthermore acts(by ihe lower end of the style F, embracing also its Standard) in

Ag. Mag. Vol. 9 T>