CO129-229 - Acting Governor Marsh & Public Offices - 1886 [11-12] — Page 538

CO129 Colonial Office Hong Kong Records 理藩院香港檔案 All AI Reviewed

535

Yastam Works,

of the proper way in which to test Portland Cement

27. (a) When ground the Cement is sampled, and weighed, by myself or my Staff - Samples are taken from various parts of the heap so as to get an average of the whole - These samples are then weighed in Imperial bushel measure of special diameter and depth - The cement is fed into the measure by means of a specially constructed hopper with an annular outlet allowing only a definite quantity to pass through in a given time. This outlet is exactly 18″ above the top of the measure - The cement is shaken slowly into the hopper - when full the measure is struck and weighed - Great care must be taken not to touch or shake the measure or hopper while the process continues - If the average of the weighings be 1/2 lbs or over the cement is accepted for weight.

(b) Samples are then brought to my testing rooms here - known weights of cement are sifted in special sieves of 1600 meshes to the square inch - The residue is weighed and the average of the several siftings taken. If the residue be not more than 10% of the total weight of the Cement it passes for fineness.

(c.) Buru-

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535 Yastam Works, of the proper way in which to test Portland Cement 27. (a) When ground the Cement is sampled, and weighed, by myself or my Staff - Samples are taken from various parts of the heap so as to get an average of the whole - These samples are then weighed in Imperial bushel measure of special diameter and depth - The cement is fed into the measure by means of a specially constructed hopper with an annular outlet allowing only a definite quantity to pass through in a given time. This outlet is exactly 18″ above the top of the measure - The cement is shaken slowly into the hopper - when full the measure is struck and weighed - Great care must be taken not to touch or shake the measure or hopper while the process continues - If the average of the weighings be 1/2 lbs or over the cement is accepted for weight. (b) Samples are then brought to my testing rooms here - known weights of cement are sifted in special sieves of 1600 meshes to the square inch - The residue is weighed and the average of the several siftings taken. If the residue be not more than 10% of the total weight of the Cement it passes for fineness. (c.) Buru- 1

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535 Yastam Works, of the proper in which to test Portland, way in Gement 27. (a) When ground the Cement is sampled, and weighed, by myself or my Staff - Samples are taken from various parts of an the heap so as to get an average of the whole - These samples are then weighed in Imperial bushel measure of special diameter and depth- The bement is fed into the measure by means of a specially constructed hopper with an ammular outlet allowing only definite quantity to pass through given time. This outlet in a a is exactly 18′′ above the top of The cement is the measure- Shaham Shaken slowly into the hopper- when full the measure is struck and weighed - Great care must be taken not to touch or shake the measure or hopper while the process continues - If the average of the weighings be 1/2 lbs or over the cement is accepted for weight- ما (b) Samples are then brought my testing rooms here- known weights of cement are sifted in special sieves of 1600 meshes to inch- The residue is weighed and the average of. the several siftings taken the If square the residue be not more than 10% of the total weight of the Cement it passes for fineness- (c.) Buru- 1

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535

Yastam Works,

of the proper

in which to test Portland,

way in

Gement

27. (a) When ground the Cement is sampled, and weighed, by myself or my Staff - Samples are taken from various parts

the heap so as to get an average of the whole - These samples are then weighed in Imperial bushel measure of special diameter and depth-

The bement is fed into the measure by means of a specially constructed hopper with an ammular outlet allowing only definite quantity to pass through

given time. This outlet

in a

is exactly 18′′ above the top of

The cement is

the measure-

Shaham

Shaken slowly

into the hopper-

when full the measure is struck and weighed -

Great care must be taken

not to touch or shake the measure

or hopper while the process continues -

If the average of the weighings

be 1/2 lbs or over the cement is accepted for weight-

ما

(b) Samples are then brought

testing rooms here- known weights of cement are

sifted in special sieves of 1600 meshes to

inch- The residue is weighed and the average of. the several siftings taken

the

square

the residue be not more than 10% of the total weight of the Cement it passes for fineness-

CO129-229 - Acting Governor Marsh & Public Offices - 1886 [11-12] — Page 538

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