Browse Items (3473 total)

Brass compass with silvered dial; outer scale in degrees anticlockwise; inner scale N/NE/E...NW. Needle locking handle.

2 string (wire) sonometer with screw tension. Dovetailed box with 4 sets of ornate slots between bridges. Later addition of small brass pulley on one end and brass hook on other to take wire with weights. Probably purchased by Prof Thomson.

Circular magnifying lens on brass stand. Can rotate and can be extended in height.

Brass pump with T handle; detached end piece. With leather washers.

Bulls-eye lens with ball and socket joints at either end of stand rod. For illumination of microscope specimens.

The curved vanes have been calculated to give straight-line tuning across the dial. Behind the dial, a travelling pointer illuminated by two small bulbs can be swept around to tune in to the stations. 2 (?) gangs of closely spaced vanes. Hand…

With separate closing end. 5 coils per leg. Brass terminals. Combination typical of early to mid 19th century coils.

cylindrical box with "Atwood's Replace Riders" written on top. Inside contains 15 metal slides of varying size with a hole punched in each of them.

Plate on side: ' 7.5 AMPS / FOR USE WITH MODEL S66, N61793 '. With 2 terminals.

' 1000 OHMS / 0.1 AMPS '