UNITED STATES MARINE POST OFFICE, DETROIT, MICHIGAN
On Wednesday, June 19, 1895, the marine post office, established at Detroit by order of the postmaster-general, will begin the delivery of mail, including registered matter, to all boats passing Detroit.
The success of the marine service will in a large measure, depend on the co-operation of the vessel interests, and, as this service has been established almost solely for the benefit of those interests, their hearty co-operation is confidently relied upon. With their support it is anticipated that the benfits that will accrue to the vast marine interests of our lakes from a mail service which will be prompt, certain and reliable, will quickly become manifest and will immediately be taken advantage of by all concerned in lake navigation.
It will be necessary for the boats desiring to receive or deliver United States mail to enter the American channel, but only at the point of delivery.
The marine postoffice station will be located near the ferry landing, between Woodward avenue and Bates street, and deliveries will be made as nearly opposite that point as possible by a launch and small boats; the service being a continuous one, night and day.
The delivery of telegrams through the mails may be had by attaching a two-cent stamp to the telegram, and, for immediate delivery, the addition of a special delivery stamp.
Mail for delivery by the marine postoffice should be directed to the "Marine Postoffice, Detroit, Mich.," and deliveries will be made throughout the entire period of navigation. During the close of navigation the station will be kept open for the accommodation of seamen residing at Detroit.
The attention of masters and officers of boats is especially called to the following code of signals, and the masters are requested to have this circular posted in a conspicuous place upon their boats.
Signal to passing boats from U.S. mail boat for delivery of mail: Blasts - One long, one short, one long.
Signal for steam vessels wanting mailboat to call for mail: Blasts - One long, one short, one long.
Signal for sailing vessels requiring mailboat: White flag by day; flashing bright light at night.
Signal from mail boat to large boats to check down: Three blasts of mocking-bird whistle.
Signal from rowboat belonging to mailboat when approaching vessels for delivery of mail: White flag in daytime; swinging bright light at night.
Signed: JOHN J. ENRIGHT