Envelope sealer
Even today, most mailing envelopes are made with an adhesive that has to be moistened before sealing. Licking the envelope is fine for just a few letters, but gets much harder when you have dozens or more to send at once. The wheel of this moistener is suspended over a water-filled tray; spinning the wheel provides a wet surface ready to moisten any stamp or envelope for sealing.
These devices are still available today, but the switch to self-stick stamps and the rise of online marketing and social networks have made it much less useful than it once was.
These devices are still available today, but the switch to self-stick stamps and the rise of online marketing and social networks have made it much less useful than it once was.
