{"product_id":"variable-mutual-inductometer-qty-1","title":"Variable mutual inductometer Qty 1","description":"\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003eCambridge Instrument Co. Ltd. Campbell Variable Mutual Inductometer, England. A precision laboratory instrument designed for the accurate measurement and calibration of mutual inductance, based on the Campbell method. Featuring decade multiplier dials (×100 and ×10), terminal selectors, and a large direct-reading scale calibrated in microhenries (absolute), the instrument was used in electrical standards laboratories and research work. Housed in a polished wooden case with engraved ebonised panels, it represents high-grade British scientific instrument manufacture. Early to mid-20th century, c.1920s–1940s.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eW26 x D36 x H20 cm.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eReplacement value £400\u003c\/p\u003e","brand":"Cambridge Instrument Company","offers":[{"title":"Default Title","offer_id":53151356191059,"sku":"VAR-790","price":40.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/8674\/0307\/files\/variable_mutual_inductometer_electrical_tester_scientific_Industrial_powerhouse_props_prop_rental_hire_vintage_movie_film_set_dec.jpg?v=1772477226","url":"https:\/\/powerhouseprops.co.uk\/products\/variable-mutual-inductometer-qty-1","provider":"Powerhouse Props","version":"1.0","type":"link"}