A job which requires experience and good judgment is the setting of porcelain washbowls to marble slabs. Although it may look like an easy job, no one can do this work well unless having had considerable experience. In setting washbowls to marble slabs there are some things to be considered, and to accomplish these things in a satisfactory manner there must be some calculations made. To have a washbowl properly fitted to a marble slab it is necessary to grind the flange of the bowl so that it also takes off the glazed surface and allows the plaster-of-Paris to take hold of the procelain will lav level on the slab. This has to be done by rubbing the upper surface of the flange of the bowl on the marble, using sand and water on the marble, until the top edge of the bowl is perfectly flat and level. This grinding action and make a perfect joint. The bowl must be set perfectly even all around with the hole in the slab. The less plaster used in setting bowls the better. It is a poor job that has to be filled up with a large amount of plaster. To get the position of the holes for the bowl clamps, it will be necessary to mark on the back of the slab the exact position of the edge of the bowl, then space off the distance and drill the slab for at least four clamps. In drilling the slab for the clamp holes the polished surface of the slab must rest on the floor, and in order not to scratch or injure it the slab should have under it a bed of some soft and clean material. The clamps should be well calked into the slab with melted lead, and made so that they will not shake nor pull out. Independent bowls for attaching to marble slabs are shown in Figs. 143 and 144. They are provided with brass plugs and coupling and rubber stopper for the waste.

Washbowls 190

Fig. 140.

Washbowls 191

Fig. 141.

Washbowls 192

Fig. 142.

Washbowls 193

Fig. 143.

A roll-edge washbowl with removable strainer at the overflow, nickel-plated plug and coupling and rubber stopper, and bronzed brackets is shown in Fig. 145.

A half-circle roll edge washbowl with high back and apron, cast in one piece, is shown in Fig. 146.

Washbowls 194

Fig. 144.

Fig. 147 shows a roll-edge oval washbowl with overflow with removable strainer, bronzed brackets, nickel-plated plug and coupling and rubber stopper.

A roll-edge corner washbowl with oval bowl, removable nickel-plated strainer, nickel-plated plug and coupling and rubber stopper is shown in Fig. 148.

Washbowls 195

Fig. 145.

Washbowls 196

Fig. 146.

Washbowls 197

Fig. 147.

Washbowls 198

Fig. 148.

A roll-edge slab and bowl with ideal waste is shown in Fig. 149. It has a round bowl and high back.

A vertical cross section of the above bowl showing the ideal waste is given in Fig. 150.

The proper sanitary plumbing connections for a washbowl are shown in Fig. 151. The cast iron soil pipe is 4 inches in diameter. The waste pipe from the bowl and the air-vent pipe from the top of the syphon are l inches and the main air pipe 2 inches in diameter. Drinking Fountains. A solid porcelain double roll edge drinking fountain with back and bowl in one piece is shown in Fig. 152. It has a self-closing faucet and nickel-plated drip-cup with strainer. A one-piece solid porcelain drinking fountain with roll-edge bowl is shown in Fig. 153. It has a self-closing faucet and nickel-plated half S-trap.

Washbowls 199

Fig. 149.

Washbowls 200

Fig. 150.

A marble drinking fountain is shown in Fig.

154, which has a counter sunk slab and high back, nickel-plated Fuller pantry cock, drip-cock with shield, nickel-plated supply pipe, and trap with vent and waste to wall.

Washbowls 201

Fig. 151.

A drinking fountain with marble slab, back and side-pieces, nickel-plated Fuller pantry cock, drip cup with shield and nickel-plated brackets is shown in Fig. 155.