W. Bell & Co. said yesterday that its net income for the second quarter dropped 8 percent to $1.95 million (64 cents a share) from $2.1 million (70 cents) during the same period a year ago.

Sales for the Rockville-based company slipped 3 percent to $58 million from $60 million during the second quarter of 1984.

Sales and earnings for the second quarter were affected by a "soft retail environment," said the company, which operates 21 catalogue showrooms in Maryland, Texas, Virginia, Illinois and the District.

For the first six months. the company's net income dropped 25 percent to $1.7 million (56 cents) from $2.2 million (75 cents) during the same period in the preceding year.

Sales for the first six months declined 6 percent to $82.3 million from $87.2 million during the same period in 1984.

W. Bell also announced the planned opening of a 20,000-square-foot showroom this summer in Norridge, a suburb of Chicago. The opening, along with a previously announced opening of a showroom in the Oak Lawn suburb of Chicago, brings the number of showrooms in Chicago to five.

*Washington Gas Light Co. announced that its fourth-quarter net income applicable to common stock climbed to $16.2 million (99 cents a share) from $14.3 million (89 cents) during the same period a year ago.

The increased earnings were attributed to colder weather during the quarter. Revenue rose to $89.8 million from $82 million in the fourth quarter of 1984.

Net income applicable to common stock for the year jumped to $40 million ($2.46) from $38.8 million ($2.45) during 1984. Revenue for the year climbed to $300.3 million from $296 million in 1984.

*Allegheny Beverage Corp. reported yesterday that its earnings for the quarter soared to $4.4 million (48 cents a share) from $88,000 during the previous year.

Earnings rose to $6.5 million before an extraordinary loss of $2 million relating to the sale of Allegheny Pepsi-Cola Bottling Co. in May 1985. The gain on that sale was adjusted based on the final audit, according to John E. Baker, senior vice president and chief financial officer of Allegheny.

Allegheny Beverage, which is based in Cheverly, is a diversified services conglomerate with operations in food service and vending, coin-operated laundries, building maintenance and office furniture.

Revenue for the period climbed 128 percent to $298.3 million from $130.7 million a year earlier. The growth in revenue was mainly due to gains in the food service and vending division, reflecting the acquisition of Servomation Corp. as well as continued growth of the division's business, the company said.