This general-purpose strip-chart recorder was manufactured by the Sanborn Company between 1935 and 1955.听This particular version鈥痺as configured to allow the simultaneous recording on a strip of paper of two "leads" of the electrocardiogram, but it could also be customized to record other signals such as those related to muscle contraction.听听听
Height:听81 cm听
Width:听78 cm听
顿别辫迟丑:听38听肠尘听
Manufacturer:听Sanborn Company听
Model:听Recorder model听60-1300听
D.C. Amplifier 64-300A听
Material:听Wood, paper, plastic听
Date: c1935-1955听
General-purpose strip-chart recorders were manufactured by the Sanborn Company between 1935 and 1955.听This particular version鈥痺as configured to allow the simultaneous recording on a听single听strip of paper of two "leads" of the electrocardiogram.听 However, it could also be customized to record other signals, such as听those听derived from muscle contraction.听听
Several听modules听are 鈥減lug-ins鈥�,听in听that听they听can be easily听lifted out of the machine听and replaced with a different听module serving a different听function.听听This machine has an 鈥淓CG PREAMP鈥� module and two 鈥淒C AMPLIFIER鈥� modules:听
The听鈥淓CG PREAMP鈥澨齧odule听(鈥淓CG鈥澨�=听electrocardiogram, 鈥淧REAMP鈥澨�=听鈥減reamplifier鈥�)听has two channels听(hence the origin of听the name 鈥淭win-Viso鈥�),听so that one can听obtain听a simultaneous recording of any two different 鈥渓eads鈥� of the ECG.听听
The lead-selector switch听(arrows)听allows听selection听of any one of the听12 classic ECG leads: standard limb leads I-II-III, augmented extremity limb leads听aVR-aVL-aVF, and chest leads V1-V6. The INSTO control allows recording the ECG trace without听having to听wait听for the machine鈥檚听vacuum听tubes to warm up, which was important for听being able to听capture听urgent or fleeting cardiac events.听听
The听output of one preamplifier is sent to one of听the two D.听C.听AMPLIFIER modules, whose output听provided听a strong enough signal听to drive the two pen recorders听on听the听left听side听of the instrument.
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