HOLBROCK´S PLANETARIUM Holbrook's School Apparatus Co. Hartford, Connecticut. Ca 1850 A American planetarium, the planets of the solar system and their moons represented by green painted wooden spheres attached to iron rods, Planets turning by clockwork brass gearbox , under 10 cm wooden sun, engaged by small crank. Total H: 40cm, largest diameter ca 52 cm Holbrook was the first major promoter of school models and also a primary innovator in developing American orreries and planetaria.
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