This object is believed to be associated with training at the Parkville Secondary Teaching College during the 20th Century.Related to objects 450 and 452This rectangular wooden resistance decade box features four large dials for controlling resistances. The dials are mounted atop a black plastic panel, each with a square base. Three smaller dials are mounted to the right of the large dials.Embossed plaque at front: 'J. L. WILLIAM / SCIENTIFIC INSTRUMENTS / SERIAL No 3960 / TYPE RB4DS / MELBOURNE / AUSTRALIA' Engraved and filled white on top plate from left to right: 'ABSOLUTE OHMS AT 20 C / MANGANIN' Logo reading: 'J. L. WILLIAM / SCIENTIFIC / INSTRUMENTS / MELBOURNE / SERIAL No 3960' 'ZERO RESISTANCE / 0.004 OHM' Engraved on back edge of top panel: 'SECONDARY TEACHER COLLEGE PARKVILLE' Dials are labelled underneath with unit measurements for resistance settings, engraved and in-filled white.j. l. william, decade box, electrical equipment, resistance decade box, scientific instruments

Rectangular frame with coiled metal wires on two opposite sides. Symmetrical placement of screws with connecting wires and terminals between the two sides. Removable cylindrical pin through center of top plate. Four smaller coils of wire secured to underside of top plate. Object rests on ends of three screw feet, two forward and one rear.Engraved at center of top plate: ' H. TINSLEY & CO. LONDON S. E.' Engraved at lower centre of top plate: 'NO 16949' Engraved on top of cylinder pin: 'NO 19908' Front side of top plate engraved with: 'DEFLECTING COILS' Engrave on center base of front side: '10 / VOLTS' Left side of top plate label: 'NAT. PHIL. LAB. / NO 65 / UNIV. OF MELB.' Associated label separate to object also has inscription on recto: 'Schering & / Schmidt / Galvanometer' and upside down on verso: 'A. C / [r] [e] [...] Gold[l]ing / p.p. 245' (writing unclear)galvanometer, tinsley & co, schering & schmidt, electrical instruments, ammeters

Related to objects 450 and 451.Resistance decade box constructed from rectangular base of ferrous metal with black plastic top. Top displays five circular dials with three smaller circular dials on the right. Embossed plaque at front: 'J. L. WILLIAM / SCIENTIFIC INSTRUMENTS / SERIAL No 3012 / TYPE RR5S / MELBOURNE / AUSTRALIA' Engraved and filled white on top plate from left to right: 'ABSOLUTE OHMS AT 20 C / MANGANIN' Label reading 'PHYSICS PT 2 222 A4' Logo reading: 'J. L. WILLIAM / SCIENTIFIC / INSTRUMENTS / MELBOURNE / SERIAL No 3012' 'ZERO RESISTANCE / 0.006 OHM' Dials labelled underneath with unit measurements engraved and filled white.decade box, resistance decade box, j. l. william, electrical equipment, scientific instruments

Related to objects 451 and 452Resistance decade box constructed with a rectangular wooden body and black plastic top displaying five large dials and fifteen smaller dials. Unit measurements are inscribed beneath each dial.Left to right on top panel surrounding dials: 'INT / OHMS AT 20 C MANGANIN / PURCHASED BY UNIVERSITIES COMMISSION / J. L. WILLIAM MELBOURNE' Adhered label at center of top, between dials: 'Part 2 W B S' Long front side has an metal panel with paper label and PVC covering demonstrating setup that has 'SERIAL No 416' engraved along upper edge. j. l. william, scientific instruments, resistance decade box, electrical instruments, decade box

Horace Darwin, youngest surviving son of Charles Darwin, was a founding partner of the Cambridge Scientific Instrument Company in 1881 (http://www.museumoftechnology.com/cic.html).Composite object with three feet supporting two squared cylinders attached to a clamping device and metal block with four current terminals. Cylinders are covered with red leather. Metal block and clamp base appear painted.Engraved on terminal block: 'No 15548 / THE CAMBRIDGE SCIENTIFIC INSTRUMENT CO LTD. CAMBRIDGE. ENGLAND' Engraved on side of terminal block: 'To be excited from 200 volts circuit / with coils in series. Connect terminals 2 & 3.'cambridge scientific instrument company, electro magnet, electrical equipment, electrical instrumentation

Keys: ELECTRICAL!