How do I adjust the seat height?

Most antique office chairs rely on a central threaded rod. You adjust them by physically rotating the seat clockwise or anticlockwise. Some later models feature a locking collar. You need to loosen this nut before spinning the seat.

I have an old wooden swivel chair with leather upholstery that feels a bit wobbly when I lean back, is this normal for its age?

A slight rock is standard for seating with tilt mechanisms. The heavy iron springs under the seat lose some tension after decades of daily use. Check the bolts connecting the iron spider to the wooden frame. Tightening these fixings often resolves excess movement without needing mechanical intervention. If the central threaded spindle clunks loudly, the iron casing might be worn. Heavy grease sometimes dampens the noise.

Can the castors be replaced?

Changing broken castors is a standard repair. Most original brass wheels sit on steel pins hammered into the wooden legs. Modern replacements fit the same socket holes. Sourcing period-correct brass cup castors improves the overall stance and protects wooden floors from old metal edges.

My grandfather left me a heavy oak desk chair with no arms and a very short back, what kind of work was this designed for?

You are describing a typical typist's or operator's chair. The armless design emerged as keyboards became standard in commercial spaces. Clerks needed freedom of movement for their elbows while typing or operating early telephone switchboards. A low back provides lumbar support while keeping the shoulders unhindered. These models usually lack the deep tilt mechanism found on a manager's chair. The focus remained on upright task work rather than relaxed reading.

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Antique Office Chairs Dated 1900 - 1920

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A robust seating form developed for prolonged desk work. Antique office chairs often feature early revolving mechanisms and adjustable height stems to accommodate clerks, ranging from solid wooden captain's styles to heavily upholstered director's seats.