As it then touches the ear, pressure that contacts the disks is relieved, causing the fishing pole string to unwind slightly, allowing the roll right side movement again, thereby maintaining a constant balance with the continual left-right adjustment holding the roll to centre. To simplify its operation: two friction disks are utilized, as the roll wanders to the right, the aluminium friction disk is pushed into contact with the brass disk, this allows the fishing line to be wound on its spindle, pulling down a lever that pushes the roll shaft to the left. The device works with one ear against the left margin of the roll. It works smoothly and with a slight 'chugging' sound as the valve works.Ī simple mechanical roll centering device commonly known as a 'fishing pole' for obvious reasons, may be seen in the picture above. The wind motor is a compact three hinged double pneumatic unit with rotary valve to open and close all three double pneumatics. All directly attributed to the restriction of vacuum channels, as previously mentioned. The foot pump is small in comparison to similar systems and controls such as the motor governor and rewind stack shut-off pneumatics, are attached directly to the wind chest.
In fact, an economy of all the player systems were effected by Gulbransen. This screwed unit pneumatic system, was introduced as far more cost effective from a service point of view, as one single faulty pneumatic could be easily replaced and did not necessarily condemn the entire stack. Later stacks have unit pneumatics screwed to the chest and are easier to restore, bearing in mind that each unit must be split in order to effect replacement of valve faces, pouch, and recovering of the pneumatic. When a stack was returned for service during the 10 year warranty period, the faulty stack was burnt and a brand new stack delivered to the customer. These glued stacks may be recognised by the lack of screws on front of the pneumatic board and are not recommended for inexperienced restorers. Originally each of three pneumatic boards (housing the valve assemblies) were glued to the vacuum chest and while this made for an extremely airtight stack, it was and is equally difficult to separate and repair. If there were awards for efficiency, the Gulbransen would win hands down.
With a well restored Gulbransen player, you may literally feel each note play through your feet on the treadles.
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The player system utilizes very small channels in the pneumatic board to minimise the suction required to run the player pneumatics, this allows a minimal pedalling requirement to achieve full sounding music. G ulbransen pianos were well built and high quality despite being produced en mass.
The Gulbransen 'Registering Piano' and trademarked 'Easy to Play' baby logo, was one of the best known brands of it's time and one of the best known trademarks in the world. Established by the innovative Axel Gulbransen in 1904, by the late teens Gulbransen was the largest player piano manufacturer in the world. mass produced player pianos in Chicago Illinois. Arguably the most successful, certainly the most prolific manufacturer of player pianos in history, the Gulbransen Co.
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