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Phosphorus bronze is an alloy of copper and tin ( up to 11 %).

Phosphorus bronze is used at places where fatigue, wear resistance and corrosion resistance are required.

A sunk key is provided with half in the keyway and half in the keyway of hub or boss of the pulley

Woodruff key is a type of sunk key. It is semicircular in section.

The primary advantage of the woodruff key

i) This key is Self-adjusting type while transmitting power in a shaft

ii) Extra-depth of the key in the shaft prevents slipping phenomenon between the two members

Conical head rivets are used at places where hand hammering is involved.
Counter Sink head rivets are used at places like ship building where flush service are necesaary.
Snap head rivets are used at heavy structural work and machine riveting.
Pan head rivets have maximum strength, but these are difficult to shape.

Bench vice: The complete construction of this vice is made of cast iron. Both its jaws are made of tool steel. The spindle handle is made of mild steel. This vice is most widely used in a workshop.
Leg vice- It is generally used in the blacksmithy shop. A hot job is fastened in it and blacksmithy operations like forging, bending, etc. are done. It is fitted in the workbench in a hanging manner. It contains one leg. which is straightway placed on wood.
Tool makers vice: It is generally for holding non-ferrous metal jobs and other small jobs by the tool makers. Its jaws are made plain, which avoid bruising of the jobs. There is no need to fit this vice on the table etc. It can be held in hand or simply placed on a table for filing etc. It has been shown in Figures.

OPC contain 62% of Lime in optimum constitution. It is one of the major constituent in the cement manufacture.

Excess lime in cement causes unsoundness due to the excess slaking action it causes when reacts with water.

Cement manufacturing is done using both dry and wet process. Dry process is usually done for blast furnace slag.

Silica having an optimum dosage of 22% give strength to the cement. If added in excess increases the setting time of cement.

Silica having an optimum dosage of 22% give strength to the cement.
If added in excess increases the setting time of cement.
Silica imparts strength to cement.

When an object is cut in a plane parallel to horizontal Plane (HP) then, the sectioned view can be viewed in Top view (or )Plan or in Bottom view.

When an object is cut in a plane parallel to Vertical Plane (VP) then, the sectioned view can be viewed in right side view/ left side view or in Front view/elevation.

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