Publication: Daily Evening Bulletin
San Francisco, CA, United States
APPLICATIONS OF ELECTRICITY
Gratifying Growth of the Electrical Construction and Maintenance Company—Description of the Factory and its Products.
Electricity as a Medium of Communication, and as a Guard against injury from Fires or Thieves—Remarkable Showing of Human Ingenuity and Skill.
Commencing in a quiet and unostentatious manner, in the year 1871, with only three employes and a small amount of invested capital, the Electrical Construction and Maintenance Company of this city has matured into an important industry, with a capital stock of $100,000. The officers are as follows: George S. Ladd, President; James Gamble, Vice-president; and Stephen D. Field, Secretary and Electrician. The regular routine business of the company seldom brings into public notice, and yet, after careful study of its operations, the writer feels assured that all who take an interest in the progress of the city will be pleased to learn a few facts in regard to the peculiar work of this enterprise. The factory proper occupies the entire third story of the Levison Brothers' building, No. 134 Sutter Street, and comprises an office, salesroom, and workshop, covering an area 66 feet by 120. At present it furnishes regular employment to thirty-five white men. The company manufacturers every conceivable variety of telegraphic and electrical apparatus, batteries, supplies, telegraph construction material, fire-alarms, electric gongs, private line machines, etc., and a very important branch of its business is contracting for the construction and maintenance of telegraph lines, city fire-alarms, and other electrical systems.
ELECTRIC BURGLAR ALARMS
One of the most ingenious inventions of the age is the electric burglar-alarm manufactured by this company. Its mysterious workings are calculated to surpass the understanding of any but the initiated and certainly to daze the burglar. The individual who clandestinely endeavors to gain an entrance to a building wherein one of these alarms is located is only too glad to beat a precipitate retreat before carrying into affect his infamous designs. This is certainly one of the beneficiaries of science. The arrangement of the alarm is simple, and, after explanation, easily understood. Small springs are concealed in the doors and windows of the house in such a manner as to open or close (according to the form of the alarm adopted), when the door or window is opened. Wires are carried from each spring to the bed-chamber, and attached to an electric gong and indicator in connection with a small battery placed elsewhere in the house. Upon closing the house for the night, the alarm system is switched on, after which, if any door or window in connection is opened—even an inch—the alarm gong vibrates violently, and the indicator shows the locality of the disturbance. The master of the house is, of course, aroused, and knows whether to travel with his battery. The gong can be arranged with special reference to alarming the burglar, or fixed for the benefit of the head of the house alone. There is no limit to the number of points which can be protected in this manner. The stable and other outbuildings can all be brought under the surveillance of this alarm, when desirable. The wires are put into the most stylish houses now built, without defacing the woodwork, and are entirely concealed from view. A