Efficiency defects of the earth-moving wheel machine

The wheel deficient in eight things

This wheel has three operations, two of them wasted, and is deficient in eight things: its semi-diameter of 6 braccia does the office of only 2; men throw away two-thirds of their journey; it turns back a quarter to unload the box onto the hook of the jib; and it halts until the box returns empty.

Seven men doing the office of only two and a half

With 31 3/7 paces this wheel of 10 braccia diameter pulls 3 1/7 braccia of rope and gives one full turn. Much is lost here, because the seven men who turn it do the office of only two and a half.

One spadeful through three hands

Here one spadeful of earth passes through three hands before reaching the box: the digger who loosens it, the spade that lays it on the barrow, and those who carry the barrow, which often makes a long journey before it reaches the box that pulls it.

Nella metà sinistra del foglio, figure e calcoli matematici.

Nella metà destra del foglio, dall’alto verso il basso: Figura con lettere e a lato testo cassato:

Sotto, non cassato:

Segue sotto altro testo cassato:

Sotto, non cassato:

In the left half of the sheet, figures and mathematical calculations.

In the right half of the sheet, from top to bottom, a figure with letters and, beside it, a crossed-out text:

Below, not crossed out:

Below follows another crossed-out text:

Below, not crossed out:

Efficiency defects of the earth-moving wheel machine

On this page

The wheel deficient in eight things

Seven men doing the office of only two and a half

One spadeful through three hands